41. We agree to accept they thought was the best tourist guide.
A. whatever B. whomever C. whichever D. whoever
42. Although many people view conflict as bad, conflict is sometimes useful it forces people to test the relative merits of their attitudes and behaviors.
A. by which B. so that C. in that D. provided that
43. A beam of light will not bend round corners unless to do so with the help of a reflecting device.
A. made B. being made C. having made D. to be made
44. A knock at the door again! It was the third time someone me that evening.
A.has interrupted B. had interrupted
C.to have interrupted D. would have interrupted
45. The government agrees to install services by residents over a ten-year period.
A. which are to be paid for B. for which to be paid
C. which to be paid for D. to be paid for which
46. He would always ignore the fact of such a contradiction in his inner thought.
A. there to be B. there being C. it being D. there having been
47. A convenient way is to set the food on a piece of aluminum oil, to the air for half an hour, and then cover it with a dish.
A. let it stay open B. let it stayed open
C. letting it stay open D. letting it stay opened
48. They us willingly but that they happened to be short of hands, too.
A. would help B. would have helped
C. were going to help D. must have helped
49. Research findings show that we spend about two hours dreaming every night,no matter what we during the day.
A. should have done B. would have done
C. may have done D. must have done
50. If you are to catch a train, it is always better to be comfortably early than even a fraction of a minute late.
A. too B. very C. much D. rather
41. Dwhoever引导名词性从句，并在从句中做主语，用来指人。they thought 是插入成分。
42. Cin that“是因为”，引导原因状语从句，符合句意。by which表示手段；so that引导目的状语从句；provided that引导条件状语从句。
43. Amade to do so是it is made to do so 的省略形式。unless是连词，应连接句子，所以除A以外的其他几个选项都是错误的。
44. B此处用过去完成时，是因为本句意指“到那次敲门，已经是第三次有人打搅我了”。句中用词was和that evening都说明指过去发生的事，到过去某一时刻为止已出现的情况用过去完成时。
45. Awhich在句中是关系代词，要引导一个句子，而B、C、D三个选项中都没有谓语，因此不是句子。本句意为：“政府同意提供服务设施，经费由居民在十年期间偿还。”
46. Bthere being 做介词of 的宾语，如果是介词for，则用there to be。
47. C分词短语做伴随状语，形容词open在分词短语中做补语，表示状态，不用过去分词，所以D不正确。
48. B此句是含蓄虚拟语气句，暗含的假设条件为：if they hadn’t happened to be short of hands。故应选B。
49. Cmay have done“(不管我们白天)可能做了些什么”，符合句意。should have done“本该做(但实际未做)”；would have done表示与过去相反的假设；must have done是对已发生的情况作肯定推测。
50. A句中too late相当于too late to catch the train，所以选其他词不合适。
