2019-2020年新素养导学同步人教版英语必修二练习：Unit+3+3及答案
Unit 3Section ⅢⅠ.单词拼写1．As is known to all, traffic_signals__(信号) tell drivers and pedestrians when to stop and go.2．_Personally__(就个人而言), I hate it when people become technology addicted.3．Someone who trains a person or team in sport is a_coach__ (教练) .4．In this game you're supposed to work together as a team and solve the problems as they_arise__(出现)．5．Women, in general, tend to be more concerned than men about their personal_appearance__(外表)．6．She is the same with her sister in appearance but not in_character__(性格)．7．The software can be_downloaded__(下载) for free from the Internet.8．His computer had a_virus__(病毒) when he downloaded a piece of software.9．I like to read books on_electronic__(电子的) instruments.10．Square dancing is a_type__(类型) of dance popular with the middle－aged and the elderly in China.Ⅱ.句型转换1．What did you do with the letter?_How__did you_deal with__the letter?2．With my teacher helping me，I made great progress in English._With the help of__my teacher，I made great progress in English.3．With time passing by，he became more and more intelligent._As__time_went by__，he became more and more intelligent.4．In my view，he is clever and diligent._In my opinion__，he is clever and diligent.5．Like many people，he prefers pop music to classical music._In common with__many people，he prefers pop music to classical music.Ⅲ.单句语法填空1．_Working__(work) out regularly will bring great benefits to your health.解析：句意：有规律地锻炼对你的健康有很大的好处。
分析句子结构可知，空处应用动名词作主语，表示习惯性、经常性的动作。
2．Now they can go to school_with__ the help of the government.解析：句意：在政府的帮助下现在他们能够去上学了。
短语with the help of...意思是“在……的帮助下”。
3．When he knew he_was cheated/had been cheated__(cheat), he felt like he was a fool.解析：句意：当得知被骗后，他觉得自己是一个傻瓜。
主语he与cheat之间是被动关系，根据空后的felt like可知，此处用一般过去时或过去完成时的被动语态。
4．But later, people developed a way of printing，_using__(use) rocks.解析：句意：但是后来，人们利用石块发展了印刷术。
根据句子的结构来判断，people 与use之间为逻辑上的主谓关系，故此处要用动词－ing形式作方式状语。
5．We should be allowed_to make__ (make) our choices.解析：句意：我们应该被允许作自己的抉择。
allow sb.to do sth.意思是“允许某人做某事”。
注意此处是该结构的被动形式sb.be allowed to do sth.。
6．There_stands__ (stand) a high monument and two tall trees in the middle of the square.解析：句意：广场中间矗立着一个高高的纪念碑和两棵大树。
在there be句式中，谓语动词要使用“就近一致”原则，故谓语动词的单复数要与a high monument保持一致。
故填stands。
7．She gave me some useful tips on_how__ to deal with the matter.解析：句意：就怎样处理这件事，她给了我一些有用的建议。
deal with表示“处理；对付”常与how连用；do with常与what连用。
故填how。
8．Their inventions have contributed to the_development__(develop) of electrical engineering.解析：句意：他们的发明有助于电气工程的发展。
根据句子的结构可知，此处要用名词形式。
9．He speaks English as_fluently__(fluent) as you.解析：句意：他英语说得和你一样流利。
根据句子的结构来判断，此处要用副词修饰动词speaks。
10．So far we have raised 50, 000 dollars for the poor children，_which__ is quite unexpected.解析：句意：迄今为止，我们已经为贫困儿童筹集了5万美元，这真出乎预料。
前后两个句子中间没有连词，用逗号隔开，可判断空处引导非限制性定语从句，且指代整个主句的内容，故用which引导该定语从句。
Ⅳ.阅读理解Today, we are told, children don't spend enough time in the fresh air.Many of them are addicted to a screen either on a computer or a TV—they seem to be living in a virtual world.They have lost touch with nature.But now 400 organizations in the UK, from playgroups to the National Health Service, are encouraging children to have some “wild time”．They want kids to swap at least 30 minutes of watching TV or playing computer games for time playing outside.Activities such as building dens, climbing trees, rummaging for conkers and playing hide－and－seek are just some of the things kids can do.Even if they live in a city, they can go on adventures in the garden or the park.Children often need a helping hand from Mom and Dad.They need to be shown what to do and where to go.Andy Simpson from the National Health Service says, “We want parents to see what this magical wonder product does for their kids' development, independence and creativity by giving wild time a go.”So despite the complicated world that young people grow up in now, it seems that going back to basics and experiencing “nature's playground” is what modern children need.David Bond from Project Wild Thing says, “We need to make more space for wild time in children's daily routine，freeing this generation of kids to have the sort of experiences that many of us took for granted.”This might sound a bit old－fashioned to you or maybe，like me, it made you think about sticking on your boots，getting outdoors and relieving your childhood.There's no age limit on enjoying yourself!文章大意：如今孩子们大都迷恋电视或者电脑，而在户外的时间越来越少，他们失去了与大自然亲密接触的机会。
2019新人教版高中英语必修第二册同步习题 ：UNIT 3 -Section Ⅲ 含解析
Unit 3 重点课时提升（2）Discovering Useful Structures[基础测评]Ⅰ. 单句语法填空1. So far, large quantities of information (send) to the company by email.2. Now, cellphones have features such as games, music and videos and more functions (add).3. Many new houses (build) in the flood-stricken area in the past few months.4. Up to now, no letters (receive) from my friends in the USA.5. By the time they returned to the USA, Jack’s dream (come) true.6. All the work (finish) so far.7. The floor (clean) by my mother. Let’s sleep on it.8. Many Chinese teachers (send) to Britain to teach Chinese in the past.9. The old (take) care of in our country.10. It is said that a lot of new schools (set) up next year.答案：1. have been sent 2. have been added3. have been built4. have been received5. had come6. has been finished7. has been cleaned8. were sent9. are taken10. will be setⅡ. 根据情景完成对话1. —We want to sit at the table near the window.—Sorry, but it (take) already.2. —The windows are dirty.—I know. They (not clean) for weeks.3. —How long you (employ) at this job? —Since 2004.4. —May I use your car? Mine (repair) at the garage now. —Go ahead.5. —Do you know much about John?—He (not hear) of since last year.答案：1. has been taken 2. haven’t been cleaned3. have; been employed4. is being repaired5. hasn’t been heardⅢ. 句型转换1. We often see David play basketball on the playground.David often basketball on the playground.2. The little girl is cleaning the classroom.The classroom by the little girl.3. They will publish these books next month.These books next month.4. They have discussed that problem several times.That problem several times.5. Have they encouraged the children to take more exercise?the children to take more exercise?答案：1. is; seen to play 2. is being cleaned3. will be published4. has been discussed5. Have; been encouraged[提升测评]Ⅳ. 语法填空The past years 1. (see) great changes in China. So far, China has reached a stage 2. we share leading positions in many fields. After about 800 years, the spirit of the Silk Road 3.(be) still alive. The Belt and Road, 4. (call) the Silk Road Economic Belt and the 21st Century Maritime Silk Road, aims to build5. trade network. The president of Russia has expressed his congratulations.Up to now, the Belt and Road 6. (support) by more than 100 countries and organisations, which cover about $20 trillion—around one 7. (three) of the world’s GDP.The popularity of the Belt and Road has 8. (it) roots in the human desire to trade ideas and communicate. Just take a look at the SilkRoad. Not only silk and other goods 9. knowledge about science and technology was shared across the network. This included the four great inventions of the ancient China. It was also an early way for language and cultural development and countries became influenced by one another.10. (hope), world peace and development will be promoted by the building of the Belt and Road.答案：1. have seen 2. where 3. is 4. called 5. a6. has been supported7. third8. its9. but10. HopefullyⅤ. 阅读理解AWe all need cash in order to live our lives. However, something called digital currency is slowly taking the place of cash. Digital currency is a kind of money. Usually, we use currency when we talk about a country’s money. If something is digital, it only exists on a computer. So “digital currency” means money that only exists on computers.Lots of people have digital currency accounts. They use a credit card to change their real money into digital money, and then the money goes into the digital currency account. A lot of people wonder, “Why in the world should I change my real money into digital currency?” This is a fair question, but there’s a good answer. If you want to buy something online,then you usually have to use digital currency. For example, if you’re in China and you want to buy something in Canada, then you’ll have to pay with digital currency.Many people still don’t trust digital currency. Some people think that if they can’t hold their money in their hand, then it doesn’t seem real. These people don’t feel comfortable when they see numbers on a computer screen. The computer tells them that their money is safe but these people don’t really feel safe. Another problem is security (安全). There are hackers all over the world. A hacker is a person who steals computer information. If a hacker gets the password of your digital currency account, he or she can steal your money.You have to decide whether or not you trust this new invention. Just remember one thing: If you want to buy something online, then you probably won’t have a choice. You’ll have to use digital currency.1. What does Para. 1 mainly tell us?A. What digital currency is.B. How to use digital currency.C. Why we all need cash to live.D. Where to find digital currency.解析：细节理解题。
2019-2020学年英语人教版(2019)必修第二册同步精练：Unit 3 Listening
姓名，年级：时间：Unit 3 Listening and Speaking ＆Reading and Thinking1、Now you are entering a _______ room， and can choose any topic for your _______. (chat）2、Nowadays， _______ won’t prevent us from getting in touch even if you live in a _______ land. (distance)3、It is very _______ to shop or travel now, for all kinds of apps can bring us much _______. (convenient)4、_______ of cars were _______ along the road when the traffic accident happened。
(stream)5、The files need _______, so you should go on with your _______ every day。
(update)6、It was a ________(艰难的） race.7、The concert will raise money for local ________（慈善机构).8、The total cost was ＄10，000, ________（加） 14％ interest。
9、How much ________(现金） do you have on you？10、The hotel is used for exhibitions， ________(会议) and social events.11、他整个上午都在电脑上和朋友聊天。
He's been on the computer all morning, ______ ______ his friends。
人教版新课标高中英语 2019-2020学年 必修二 Unit 3 Computers Reading 配套练习 含答案详解
Unit 3ComputersWarming Up & ReadingⅠ.单句填空1．Artificial ________(intelligent) and automation technologies are already starting to affect our work and daily lives.2．Many people think highly of him, but ________(person), I think he is actually dishonest.3．Tom waited at the station for nearly an hour ________ the train finally arrived.4. So far, English has kind of been the ________(universe)language.5．Her mother ________(total) broke down at the passing away of her grandmother.6. It's hard to watch TV these days without seeing ________(real) shows.7．With the ________ (apply) of the new technology，the output of steel almost doubled what it was last year.8．English in this story ________(simplify) several times to make it easier for children to understand.9．The farm ________(hand)down from Father to son since 1800.10．She was so weak ________she was out of breath after walking for only a few minutes.Ⅱ.短语填空as well as; so…that; compare with; in reality; from then on; provide…with…；go by; as a result; in total; share with1．It taught me a lesson.________________I made a determination that I would never put off anything important until the next day.2．Tom hurt his leg when he was running. ________________，he has to leave school for a few days.3．In the performance, the actress dressed as a parrot was ________attractive ________she attracted all the audience present.4．All I thought was that the programme was interesting and could ________me ________the knowledge I wanted.5．Whenever he buys something, whether it be drinks or snacks, he remembers to ________________his buddies.6．As the days________________，survivors were left with few options and little hope.7．________________learning to swim he has been taking Spanish lessons this summer.8．In theory, this problem should not occur, but ____________________it does.9．One of the worst things people do is to measure their success by how they ________________others.10．How much do I need to pay ________________for this package?Ⅲ.句型训练1．By the time I got to the stadium, the match______________________．(finish)当我到达体育馆时，比赛已经结束了。
2019-2020年新素养导学同步人教版英语必修二练习：Unit+2+3+巩固及答案
Unit 2Section ⅢⅠ.单句语法填空1．There is an increase of 20% in toy prices，but mascots in our shop are _a__bargain at only 1 pound each.解析：句意：玩具价格上涨20%，但是我们商店的吉祥物是一个一英镑，很便宜。
bargain 在此用作名词，意为“廉价货”。
2．By the time I saw the job_advertised__(advertise) in the newspaper，it was already too late.解析：句意：我看到在报纸上刊登的这份工作时，已经太晚了。
the job和advertise之间为被动关系，故使用其过去分词形式。
3．My father intended my brother_for__ driving but he wanted to pick_up__ the knowledge of the computer during his spare time.解析：句意：我父亲打算让哥哥学驾驶，但是他想在业余时间学点电脑知识。
intend sb.for doing sth.“打算让某人做某事”；pick up“学会”，均为固定搭配。
4．He was_hopeless__(hope) about surviving because the whole bridge fell and many cars and trucks fell down on his car.解析：句意：他逃生的希望很渺茫，因为整座桥垮塌，很多小汽车和大卡车坠落在他的汽车上。
hopeless意为“没有希望的，绝望的”，符合语境。
5．Canada is larger than_any__country in Asia.解析：句意：加拿大比亚洲的任何一个国家都大。
2019-2020学年英语人教版(2019)必修第二册同步基础练习：Unit 3 Reading
姓名，年级：时间：Unit 3 Reading for Writing1、In recent years travel companies have succeeded in selling us the idea that the further we go, _______（good） our vacation will be.2、The hotel has 110 bedrooms, all with _______(privacy） bathrooms。
3、She _______（tip) the contents of her purse onto the table。
4、Do you have any concrete thoughts on how _______（deal) with this difficulty？5、I was watching the clock all through the meeting， as I had a train _______(catch）.6、The advertisement _______ a mass audience， but it failed to achieve the _______ of more than 20，000 persons。
(target）7、Seventy percent of the workers can be _______ as low-paid. Don’t you think the _______ is correct？（define)8、It is her _______ business, so we shouldn’t spy on others’ _______. (privacy）9、There are some _______ faces in the crowd. In fact， my _______ with them is quite by chance。
2019-2020学年新素养导学同步人教版英语必修二练习：Unit 3 3 Word版含答案
姓名，年级：时间：Unit 3 Section ⅢⅠ.单词拼写1．As is known to all, traffic_signals__（信号） tell drivers and pedestrians when to stop and go.2．_Personally__(就个人而言）， I hate it when people become technology addicted.3．Someone who trains a person or team in sport is a_coach__ （教练）。
4．In this game you're supposed to work together as a team and solve the problems as they_arise__(出现）．5．Women, in general，tend to be more concerned than men about their personal_appearance__（外表)．6．She is the same with her sister in appearance but not in_character__(性格)．7．The software can be_downloaded__（下载） for free from the Internet.8．His computer had a_virus__（病毒) when he downloaded a piece of software.9．I like to read books on_electronic__(电子的) instruments.10．Square dancing is a_type__(类型） of dance popular with the middle－aged and the elderly in China。
新人教版高中英语必修2同步基础练习：Unit 3 (3课时Word版含答案
新人教版高中英语必修2同步基础练习Unit 3 Discovering Useful Structures & Listening and Talking1、Have you chosen _______(stay) in this city rather than work in Beijing?2、I promise to keep you well _______(inform) as soon as possible.3、Supper _______(prepare) when my daughter rushed in, saying that her bedroom was on fire.4、To be _______ _______ being unkind to another person. (mean)5、How could you have stayed _______(safety) from the traffic accident?6、I'm still _______ with him. His frequent visits have been _______ me recently. (upset)7、The _______ have stolen some diamonds from a shop. Their _______ can't be forgiven. (thief)8、The prices are being _______ as much as 50%. Do you think that the _______ is believable? (discount)9、There are some _______ faces in the crowd. In fact, my _______ with them is quite by chance. (familiar)10、The _______ situation made all of us feel _______. Nothing could have avoided the _______. (embarrass)11、I paid the cheque into my savings _______(账户).12、He pressed a _______(按钮) and the door closed.13、Employees can buy books at a _______(折扣).14、The fact that the policeman was prejudiced against foreigners could not be recorded in the official _______(档案).15、The members of the committee agreed to _______(敦促) the conference to deal with the problem.16、用方框内所给短语的适当形式完成下面的句子1.I have been _______ all the details I observe.2.You shouldn't have _______ the disabled girl. You hurt her self-respect.3.It seems that I _______ the voice. I heard it before.。
2019-2020年新素养导学同步人教版英语必修二练习：Unit+1+3及答案
Unit 1Section ⅢⅠ.单词拼写1．As was reported，a chemical factory _exploded__(爆炸)last night，which killed 18 workers.2．It's an _informal__(非正式的) party，so you can wear jeans tonight.3．The ship _sank__(下沉) to the bottom of the sea because of the storm.4．The judge called in several _eyewitnesses__(证人) to the killing.5．In order to hide the treasure，they put a lot of huge stones at the _entrance__(入口处) to the cave.6．Her hobbies include music and _painting__(绘画)．7．Throughout the _trial__(审判)，he kept silent，which made others feel strange.8．Our children go to the _local__(本地的) schools.9．There is a lot of _evidence__(证据) to prove that smoking has a bad effect on our lungs.10．There is always a _debate__(辩论)about whether students should use cellphones or not at school.Ⅱ.单句语法填空1．There is something wrong with the computer，so he is trying to take it _apart__ and repair it.解析：句意：电脑坏了，他正在试图把它拆开进行修理。
人教版新课标高中英语 2019-2020学年 必修二 Unit 3 Computers Grammar 配套练习 含答案详解
Unit 3Com putersGrammarⅠ句型训练1．A great number of survivors __________________________(被士兵营救) in that area where the earthquake has happened since yesterday.2．Recently a practical plan ______________(被城市官员制订) to turn our city into a green city.3．Since then, a public microblog ______________(被建立) to help people to learn more about local culture and customs in that area.4．________________________________________________________________________ (他的新小说被翻译) into French recently?5．The sports meeting of our school ____________________________________________(被推迟) because of the bad weather.Ⅱ用括号内单词的正确形式填空1．In the past few years thousands of films ____________________(produce) all over the world.2．With the development of the economy, a great many new houses ________________(build) in the past ten years.3．—Can we sit at the table near the window?—I'm sorry，but it ______________(take) already.4．Every year a flood of farmers arrive in Shenzhen for the moneymaking jobs they ____________________(promise) before leaving their hometowns.5．Such a strange thing ____________________(never hear) of in our school before.6．I want to buy this kind of cloth because I have learned that this kind of cloth ____________(wash) well.7．Every possible means ________________(try) to save the future of the baseball player so far.8．Festivals and celebrations of all kinds _____________(hold) everywhere since ancient times.9．Professor Smith will come to give us a lecture on the Western culture, but when and where ____________________(not decide) yet.10．—How long ________ you ______________(employ) at this present job in the bank?—Since 1990.11．In the past few centuries，the lighthouses along North Carolina's coast ____________________(recognize) as signs of safety for travellers at sea.12．When she returned home，Rose found her computer ____________________(remove) and she was very confused.13．We all enjoy these English songs and they ____________________(teach) quite a few times on the radio.14．He told me he ________________(treat) badly in that supermarket when he was doing shopping yesterday.15．That was the second time Barack Obama __________________(elect) as the US President.Ⅲ阅读理解AMany families these days have computers in the home and most parents allow their children to use them and it is so important that parents and their children are all aware of the risks that can be dangers to children when they do not follow important rules of teen Internet safety.It is important that everyone follows tips and suggestions to stay safe online.When it comes to your children, be aware of the friends that they hang around with.Start paying attention if they begin talking about anyone they don't hang out with after school or in class.Always ask where they know a friend.Be sure that the time that your children spend on the Internet is limited, especially if they are not using it for homework or they are younger.The less time that is spent on the Internet obviously results in less time that they are out there exposed to the dangers of the Web.Talking to your kids often is one of the best ways to stay in touch with what they are doing and what they are up to.You cannot have any idea whether there is something strange or out of place if you have no idea what is normally going on with them.However, at the same time, you need to remember how much they want new friends, so be careful that you do not berate(痛斥) your children. Allow them some freedom with the Internet, but to stay safe online, coach them about guidelines for teen Internet safety.The news about the horrible results of not following safety precautions(预防措施) is frightening, but with proper guidance mainly on the part of parents, children and teens will be able to stay safe online and enjoy it, as it should be.For more information regarding tips for teen Internet safety, just goonline for it．1．The writer writes Paragraph 1 ________．A．to warn children not to go online at homeB．to tell us the computer has come into our daily lifeC．to introduce the topic of this passage to the readersD．to advise children to stay away from the computer2．Which of the following shows that your children probably get into trouble?A．They spend too much time online.B．They stay a long time with their friends.C．They are good at operating the computer.D．They use the computer to do their homework.3．According to the passage, who should pay more attention to the children's safety online?A．Teachers. B．Parents. C．Officials. D．Policemen.4．What does the underlined word “it” refer to?A．More information. B．The children. C．The parents. D．The famous Web.BAll her life, my mother wanted busy children.It was very important that all things at her house should remain clean and tidy.You could turn your back for a moment in my mother's house, leave a half-written letter on the dining room table, a magazine open on the chair, and turn around to find that my mother had “put it back where it belonged” as she explained.My wife, on one of her first visits to my mother's house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink.When she returned, she found the packet had been removed.Confused(疑惑的), she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink disappeared.Up to then she had guessed that everyone in my family held on to their drinks, so as not to make water rings on the end table.Now she knows better.These disappearances had a confusing effect on my family.We were all inclined to(有……的倾向) forgetfulness, and it was common for one of us, upon returning from the bathroom, to find the every sign of his work in progress disappeared suddenly.“Do you remember what I was doing？” wasa question frequently asked, but rarely answered.Now__my__sister__has__developed__a__second-hand__love__of__clean__windows，and my brother does the cleaning in his house, perhaps to avoid having to be the one to lift his feet.I try not to think about it too much, but I have at this later time started to dust the furniture once a week.5．Which of the following is TRUE about my mother?A．She enjoyed removing others' drinks.B．She became more and more forgetful.C．She preferred to do everything by herself.D．She wanted to keep her house in good order.6．My wife could not find her biscuits and drink in my mother's house because ________．A．she had already finished them B．my mother had taken them awayC．she forgot where she had left them D．someone in my family was holding them7．The underlined part in the last paragraph suggests that my sister ________．A．is happy to clean windows B．loves to clean used windowsC．is fond of cleaning used windows D．likes clean windows as my mother does8．This passage mainly tells us that ________．A．my mother often made us confused B．my family members had a poor memoryC．my mother helped us form a good habitD．my wife was surprised when she visited my motherCFor many years, I strongly believed that my suffering was because of my size.I imagined that when the weight disappeared, it would take old wounds, hurts and rejections(拒绝) with it.Many people with weight problems also mistakenly believe that changing our bodies will fix everything．Perhaps our mistake is believing that being thin equals being loved, being special, and being cared for.We fantasize(幻想) about what it will be like when we reach the long-awaited goal.We work very hard to realize this dream.Then, at last, we find ourselves there.But we often gain(获得) back what we have lost.Even so, we continue to believe that next time it will be different.Next time, we will keep it off.Next time, being thin will finally bring us happiness, self-worth, and, of course, love.It took me a long time to realize that there was something more for me to learn aboutbeauty.Different cultures have different standards(标准) of beauty.In Samoa a woman is not considered attractive unless she weighs more than 200 pounds.More importantly, if it's happiness that we want, why not put our energy there rather than on the size of our body? Why not look inside? Many of us struggle hard to change our body, but in vain.We have to find a way to live comfortably inside our body and make friends with and care for ourselves.When we change our attitudes towards ourselves, the whole world changes.9．The passage tries to stress(强调) the importance of ________．A．body size B．different beauty standardsC．culture difference D．attitudes towards life10．What does the underlined word “everything” in Paragraph 2 mean?A．The whole world. B．All the problems.C．All the dreams. D．All the truth.11．What can be inferred about the author?A．The author is a Samoan.B．The author probably got wounded in wars or accidents.C．The author succeeded in losing weight.D．The author has been troubled by his/her weight.Ⅳ读后续写阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。
人教版新课标高中英语 2019-2020学年 必修二 Unit 3 Computers Grammar 配套练习 含答案详解
Unit 3Com putersGrammarⅠ.用所给词的适当形式填空1. The machine ________________ (connect) to a computer already.2. This country ________________(stop) from borrowing money internationally for the past 15 years.3．Though we don't know what was discussed, yet we all feel the topic________________(change)．4．We all enjoy these English songs and they____________(teach) quite a few times on the radio.5．—Your English is very good.—I'm still nervous.After all, it is only the second time that I ________________(meet) foreign guests.6．If the paper ________________(finish), please hand it in.7．I don't believe you've already finished reading the book—I ________________(lend) it to you this morning!8．You've failed to do what you________________(expect) to and I'm afraid the teacher will blame you.9．Every year a flood of farmers arrive in Shenzhen for the moneymaking jobs they ________________(promise) before leaving their hometowns.10．With the help of high technology, more and more new substances________________(discover) in the past years.Ⅱ.句型训练1．Too many houses________________________ in the past three years, so the prices are sure to fall.(build)在过去的三年中，人们建了太多房子，因此，房价下跌已成必然。