A．单句填空
1．We need to get to the root of the problem ________ we can solve it.
答案 before [句意：在能够解决这个问题之前，我们需要找到它的根源所在。根据句意可知用before。]
2．Just ________ a single word can change the meaning of a sentence, a single sentence can change the meaning of a paragraph.
答案 as [句意：正如一个词可以改变一个句子的意思一样，一个句子可以改变一个段落的意思。根据句意可知用as。]
3．________ scientists have learned a lot about the universe, there is much we still don't know.
答案 Although/Though/While [句意：虽然科学家已经了解了很多有关宇宙的东西，但是还有很多我们不知道的。根据句意可知填Although/Though/While。]
4．________ he once felt like giving up, he now has the determination to push further and keep on going.
答案 Where [句意：在他曾经想要放弃的地方，他现在有决心进一步推进并且坚持下去了。根据句意可知用Where。]
5．________ the students came from different countries, they got along quite well in the summer camp.
答案 Although/Though/While [句意：虽然这些学生来自不同的国家，但他们在这个夏令营中相处得很好。根据句意可知用Although/Though/While。]
6．In fact, ________ Tiffany Two celebrated her 27th birthday back in March, she had lived the equivalent (等量) of 125 human years.
答案 when [句意：事实上，当Tiffany Two 在三月份庆祝她27岁生日时，她已经活了相当于人类的125年了。故填连词when引导时间状语从句。]
7．Linda was quite sure that she was going to miss her train ________ she was not very far from the station.
答案 though/although [句意：虽然琳达离火车站不是非常远，但是她非常肯定她会错过她的火车。though/although意为“虽然”。]
8．On our last hike, we were told to take a rest ________ we felt tired.
答案 when [句意：在上次远足中，我们被告知感到累了就歇一歇。when意为“当……时”。]
9．Any measure of an ad's performance is entirely pointless ________ it could be viewed by a person.
答案 unless [句意：如果没人看，广告的任何表现形式都是完全没有意义的。考查条件状语从句。根据句意填unless。]
10．It took what seemed to be years ________ the actress finally turned up, which made the journalists as well as audiences disappointed and angry.
答案 before [句意：似乎用了好几年的时间这位女演员才最终出现，这使得记者和观众既失望 又气愤。考查时间状语从句。根据句型it takes/took some time before...，可知填before。]
B．单句改错
1．Unless the damage is done, it will take many years for the farmland to recover.
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答案 Unless→If/Once [根据句意可知此处表示“如果；一旦”，故用If/Once。]
2．It is so cold that you can 't go outside if fully covered in thick clothes.
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答案 if→unless [根据句意可知此处表示“除非”，故用unless。] 3．There is only one more day to go after your favorite music group
play live.
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答案 after→before [根据语意可知是之前，故用before。] 4．If you miss this chance, it may be years since you get another one. ________________________________________________________
答案 since→before [此处为固定结构It may be＋段时间＋before...。]
5．It was the middle of night before my father woke me up and told me to watch the football game.
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答案 before→when [根据句意可知，此处表示“当……的时候”。]
6．Actually, the London Olympic Park is built wherever there used to be a poor area called East London.
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答案 wherever→where [根据句意可知，此处表示“……的地方”，故用where。]
7．Such long as he works hard, I don't mind when he finishes the experiment.
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答案 Such→So/As [so/as long as是固定结构，意为“只要”。]
8．Misunderstandings arising from lack of social communication, if handled properly, may lead to serious problems.
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