11.(2009重庆)Peter was so excited __________ he received an invitation from his friend to visit Chongqing.
A. where B. that C. why D. when
答案：D
解析：句意“当Peter的朋友邀请他来重庆时，他非常兴奋”，此题考查状语从句，只有when引导的时间状语从句符合题意。

12.(2009福建)She had just finished her homework __________ her mother asked her to practice playing the piano yesterday.
A. when B. while C. after D. since
答案：A
解析：句意“昨天她刚做完作业，她妈妈就让她练习弹钢琴”，when在本句中作并列连词，意为：and at that time。while作并列连词，表示“对比转折”；after为从属连词或介词，意为“在……之后”；since表示“自从……时候，既然……”.

13.(2009浙江)The medicine works more effectively __________ you drink some hot water after taking it.
A. as B. until C. although D. if
答案：D
解析：句意“这种药如果你用热水送服，就更加有效”，if引导条件状语从句。

14.(2009湖南) __________ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
A. Although B. As long as C. If only D. As soon as
答案：A
解析：句意“虽然警察认为他最有可能是罪犯，但没有确凿的证据，他们不能逮捕他”，句子前后的逻辑关系为转折关系。

15.(2009江西)According to statistics, a man is more than twice as likely to die of skin cancer __________ a woman.
A. than B. such C. so D. as
答案：D
解析：句意“据统计，男性死于皮肤癌的几率是女性的两倍多”，本题考查倍数的表示法，核心结构为：It times as likely to die of cancer as …，只不过…times衍生成了more than twice两倍多，在此more than修饰twice。

16.(2009江西)Some of you may have finished unit one. __________, you can go on to Unit two.
A. If you may B. If you do C. If not D. If so
答案：D
解析：句意“你们中的一些人可能已经完成了第一单元，如果这样的话，你们可以继续进行第二单元”，本题考查so和not的用法。

17.(2009江苏) __________ unemployment and crime are high, it can be assumed that the latter is due to the former.
A. Before B. Where C. Unless D. Until
答案：B
解析：句意“在失业率和犯罪率高的地方，可以想象的到，后者是由前者引起的”。

18.(2009安徽) — I wonder how much you charge for your services.
— The first two are free __________ the third costs ＄30.
A. while B. until C. when D. before
答案：A
解析：句意“我想知道你要收多少服务费”“前两次是免费的，第三次的费用是30美元”，while而，但是；until直到；when这时候；before之前，才。

19.(2009山东)The little girl who got lost decided to remain __________ she was and wait for her mother.
A. where B. what C. how D. who
答案：A
解析：句意“那个迷路的小女孩决定待在原地等她的母亲”，where引导地点状语从句。

20.(2009辽宁)It just isn’t fair __________ I was working as a waiter last month, my friends were lying on the breach.
A. whenever B. though C. for D. while
答案：D
解析：句意“上个月我在做服务员时，我的朋友们却躺在海滩上，这不公平”，while引导时间状语从句，从句常用进行时态。Whenever无论何时，每次，引导让步状语从句或名词性从句；though尽管，虽然，引导让步状语从句；for因为，引导原因状语从句，三项均不符合句意。