1. He was very tired after doing this for a whole day，
he felt very happy since the crop did “grow” higher.
解析 考查并列连词。根据句中的very tired和very happy可知，前后两分句之间是转折关系，故填连词but。
答案 but
2. For example，television sets need not be played at full volume (音量)
loud pop music should not be played very late at night.
答案 and
3.
you don't mind，I'll stop and take a deep breath.
解析 考查条件状语从句的引导词。句意：如果你不介意的话，我想停下来喘口气。表示“条件”要用if。
答案 If
4.
the areas used for playing fields are often rough and rocky，millions of real balls go flat (变瘪) within 24 hours.
解析 考查原因状语从句的引导词。根据语境可知，“他们用于踢球的地方，常常是崎岖的，多石的”是“球变瘪”的原因，表直接原因要用because。
答案 Because
5. But the river wasn't changed in a few days
even
a
few months.
解析 考查并列连词。河流在几天或甚至几个月之后没有多大的改善。否定句中通常要用or代替and。
答案 or
6. It will be great
you can tell me some information about chopsticks，such as their origin and the materials they are made from.
解析 考查条件状语从句。如果你能告诉我们一些关于筷子的信息就太好了，比如它的起源和制作材料。you can tell me some information about chopsticks为条件状语从句。
答案 if
www.gkxx.com7. Why didn't you tell me the truth?
I booked the ticketyou promised to drive non－stop from Aye to Norwich.
解析 考查时间状语从句。这里表示在我订票之前或订票时，你许诺中途不停。
答案 Before/ When
8. I hate to say this，
they behaved impolitely towards us customers.Could you do something about this?
解析 考查连词。交际用语I hate to say this，but...。此处为固定表达。
答案 but
9. Maybe you are right.But our government allows college graduates to borrow money from banks
maybe some can get money from their parents.
解析 考查连词。我们的政府允许大学毕业生从银行贷款，也可以从父母那里得到资助。前后两个句子之间为顺承关系。
and
10.
we'll be walking for almost two weeks，I'll need to buy a large，strong，light backpack in advance to carry my supplies of food and water.
解析 考查原因状语从句。由于我们要走两个星期，所以我们需要买一个牢固的大背包。since由于。
答案 Since
11. John failed in the exam，
he had prepared a lot for it before.
www.gkxx.com
although/though
12.
the merchant faced some problems，he always turned
to his second wife and she would always help him out.
解析 考查时间状语从句。当他遇到问题时/无论何时他一遇到问题，他总是向他的第二个妻子求助而且她总能帮他解决问题。
答案 When/Whenever
13. All my children were
are now a great joy of
my life.
解析 考查连词。连接并列谓语were和are，从语意上为并列关系，所以用and。
答案 and
14. Mary's mother doesn't allow her to go anywhere outside the town
another member of the family is along.
解析 考查条件状语从句。玛丽的母亲不允许她去镇外的地方，除非有家里其他人跟着一起。unless除非，引导条件状语从句。
答案 unless
15.
we persist in this practice，gradually
we'll learn how to express ourselves in English.
答案 If
16. China produces Oolong，black，green，white，yellow
dark tea.
解析 考查并列连词。此处and连接的是并列宾语。
答案 and
17.We have organized sports competitions and we have even made a video.
it isn't all just enjoyment.
解析 考查并列连词。根据前面的sports competitions和a video可知，与“不都是娱乐活动”之间为转折关系，故要用but。
答案 But
18. Nowadays when you turn on the radio，you either hear music，a talk show
news.
解析 考查并列连词。现在当你打开收音机，你或听音乐、脱口秀或资讯。either...or...或者……或者……。
答案 or
19.Mr.Gates was only 21 years old
he first helped to set up the company in 1976.
解析 考查时间状语从句的引导词。当盖茨先生1976年建立公司时他才21岁。when当……时候。
答案 when
20. Caroline：
he practices singing，he will become a singer in the future.
Joyce：Not all people can become a singer.
解析 考查条件状语从句的引导词。句意：如果他一直练习下去，他就会成为一个歌手。if引导条件状语从句。
答案 If
21. Only 9 percent of fatal accidents happen
a plane is at cruising(平稳行进的) altitude，according to a report by Boeing in August.
解析 考查时间状语从句的引导词。当飞机平稳飞行时，只有百分之九的严重事故会发生。
答案 when
www.gkxx.com22.
a person goes at a job with determination and purpose， he may astonish himself as well as others by his ability.
解析 考查条件状语从句的引导词。句意：如果一个人意志坚决地、有目的地从事一份工作，他可以通过自己的能力让自己和他人惊讶。if如果，表示假设。
答案 If
23.Some even write postcards while they are on vacation
send them to friends.
解析 考查并列连词。有些人在度假时甚至写一些明信片，并寄给朋友们。根据句意可知此处要用and连接write和send两个动词。
答案 and
24.
neighbors want to get along well with each other，they have to show their tolerance.
解析 考查状语从句的引导词。如果或当邻居想要彼此相处友好(的时候)，他们就必须容忍。根据句意可知这里要用if或when引导条件状语从句或时间状语从句。
答案 If/When
25.I started work in a local café as a waiter.I believe that
I was offered a good position，I would resign at once.
答案 as soon as/as long as/once