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题目列表(包括答案和解析)

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Look out for cars, when ________(cross)the street.

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Don’t come in unless ________(invite)to.

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He is very famous here, so we had no trouble ________(find)him yesterday.

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I’m very busy preparing for the exam, so I can’t help ________(do)the house work.

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What doctors can do is ________(save)people’s life.

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