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　　A. I B. me C. us D. ours

　　42. The leaves of many trees turn ______ in autumn.

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　　43.—Will you go to the museum tomorrow?

　　—Yes, I will go _______ it’s windy.

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　　44. Mary used to stay up until far into the night, ______? 内容来自kaixin100

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　　45. It is very kind ______ you to supply us _______ so much information. Kaixin100内容管理系统

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　　46. Five minutes earlier, _______ we could have caught the last train.

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　　47. Many a boy and many a girl _______ it since then.

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　　48. I regretted _______ the days when I _______ hard at school.

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　　A. wasting…must have worked B. having wasted…should have worked

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　　C. to waste…could work D. to have wasted…would work

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　　49. He’s sure you’ll pass the examination, _______?

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　　50. With ______, the man had to go out of his hiding place.

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　　C. him running out D. his food run out