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You must _____ to the rules and behave properly even if you think they are unfair.

A. get across      B. keep to     C. take up    D. make up

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　— Why didn’t you come to Mike’s birthday party yesterday?

　　— Well, I ____, but I forgot it.

　　A. should  B. must C. should have   D. must have

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I don''t think it any use taking with him , you ____ as well leave him alone .

A . might       B . must       C . can       D . could

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—I did not know you were good friends.

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