根据题意，选择最佳答案，或者选取最合适的答案。

1. Would you lik e to take a trip to Hawaii this summer vacation? — No, I ___________ there several times.A．went
   went have been
解析：试题分析：句意：今年暑假你想去夏威夷旅行吗？——不，我已经去过那儿几次了。结合语境可知本句描述的是现在已经完成的动作，故用现在完成时态。选B。
2. It's much easier to make friends _____you have similar interests.
   unless when
解析：试题分析：考查连词。句意：考虑到你们有相似的爱好，那成为朋友就更容易了。unless除非, 如果不；when既然, 考虑到，当……时；结合句意，故选B
3. The water in this river is harmful because It’s a ______ river.
   pollution polluted
解析：试题分析：pollution 名词，污染；pollute动词，污染：句意：这条河中的水有害，因为它是一条被污染了的河。顾选B
4. The ______ of new technology is to make life easier, not to make it more difficult.
   Trouble purpose
解析：试题分析：句意：新科技的目的是使生活更简单，而不是更困难。A. trouble麻烦； B.purpose目的；结合句意，故选B
5. The teacher advised Tom to what he saw and what he thought during his trip.
   add up set down
解析：试题分析：考查动词短语辨析。A增加；B写下，记下；句意：那位老师建议Tom把他在旅行时看见得和所思考的都写下来。根据句意可知B正确。 考点：考查动词短语辨析
6. Who would you buy the coat_______? -- I’ll give it to my son ______ a birthday present.
   for; for for; as
解析：试题分析：短语buy sth for sb给某人买某物；故排除BC；give sth to sb给某人某物；as介词“作为”。句意：--你要给谁买一件大衣?—我将给我的儿子买一件作为生日礼物。故选D。 考点：考查介词的用法。
7. We should know that we can only reach the top if we are ready to _________ and learn from failure.
   deal with rely on
解析：试题分析：句意：我们应该知道如果我们准备好应付失败，并且从失败中吸取教训，我们一定会成功的。deal with应付；rely on依赖；watch over监视；sort out分类，选A。 考点：考查词组辨析
8. The underlined letter “ a” in the word “______” has different pronunciation （发音）from the others.
   activity trader
解析：试题分析：句意：单词中的划线字母那个和其余所有的发音不同。ABC中的a发单元音æ，D发ei,故选A。 考点：考查字母辩音。
9. Harry telephoned to the airport to______ whether Flight 24 for San Francisco is departing on time.
   confirm identify
解析：解析：Hanry打电话到机场确认24航班是否已经离开
10. After a 5-minute discussion, we came up with a better ____ to the math problem.
    access approach
解析：试题分析:句意：在五分钟的讨论之后，我们想出了一个更好的解决这道数学题的方法。A通路，接近的权利和机会；B 通道，方法；选项可以和介词to搭配，而access 是不可数名词，前面没有冠词，如固定短语：have access to ，答案选B。 考点：考查名词辨析
11. The government decided to tear down the old bridge, which was not strong enough to allow the ___ of heavy vehicles (车辆).
    flow passage
解析：试题分析：A. flow流动，B.passage通道，句意：政府决定拆掉旧桥，它不够牢固不能让车辆通过。选C。
12. He has attended the Olympics Games three times, so he has the _________ of rich experience.
    advantage use
解析：试题分析: 句意：他参加过三次奥运会，所以他有着经验方面的优势。A. advantage 优势；B. use用处。根据句意选A。 考点：考查名词辨析
13. The other two areas ____ British and American English differ are spelling and pronunciation.
    in which which
解析：试题分析：考查定语从句。在定语从句中，当由area，situation，point等名词做先行词时，要用 介词+which引导定于从句相当于直接用where进行引导。句子译为英国和美国英语在拼写和发音这二个方面都不同。故选A。 考点：考查定语从句
14. The_____ sneaked away
    dramatist drama
解析：解析：句意： 剧作家偷偷溜走了
15. Things go back to ______ since we paid off all our debts.A．formal
    formal normal
解析：解析试题分析： 考查形容词辨析。formal（学校教育或培训）正规的；regular有规律的；common普通的；normal正常的，正规的。句意是我们付清债务以后一切都回到了正常,故选D项。 考点 : 考查形容词辨析
16. Things go back to ______ since we paid off all our debts.
    formal normal
解析：考点：考查短语辨析,句意：我们还完债之后，事情又回归正常。A项正式的，B项正常的，正规的；根句意应选B
17. As long as you’ve paid in ___________, we won’t charge you for the delivery.
    charge advance
解析：试题分析：短语辨析。In charge负责；in need需要；in return作为回报；in advance提前；句意：只要你提前付款，我们就不会收你的投递费用。根据句意说明D正确。
18. In France, ______ you go, you will always see a gentleman holds a door for a lady.
    however wherever
解析：试题分析：考查让步状语从句。句意：在法国，无论走到哪里，你总能看到有绅士风度的人为女士开门。A无论怎样；B无论哪里；根据go可知，这里指的是地点，故选A。 考点：考查让步状语从句
19. My grandmother went to the ______ and had one bad tooth pulled out.
    driver dentist
解析：试题分析: 句意：我奶奶去看牙医了，并且把一颗坏牙拔掉了。A司机；B牙医；根据句意，故选B。 考点：考查名词词语释义。
20. Do you still remember the chicken farm_______ we visited three months ago?
    where. that
解析：解析试题分析：考查定语从句。句意：你还记得我们三个月前参观过的那个养鸡场吗？定语从句不能用what引导，；先行词是the chicken farm，定语从句中的visited后缺少宾语，应该用that或which引导定语从句，排除A、B；这时，that/which作宾语可省略，故选B。 考点：考查定语从句