You ______ be polite to the old man. [ ]A. should B. can"t C. might

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You ______ be polite to the old man. [     ]
A. should
B. can"t
C. might
D. mustn"t

答案

举一反三

Mr. Green ______ speak a little Chinese, but he can"t speak any Japanese.

[ ]

A. can
B. may
C. must
D. need

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He was so tired that he couldn"t work any longer.[     ]
A. wasn"t allowed to
B. shouldn"t
C. wasn"t able to
D. mustn"t

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I _____ have two wings and then fly to the moon.[     ]
A. would
B. could
C. should
D. might

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Cars and buses________ stop when the traffic lights turn red.[     ]
A. can
B. need
C. may
D. must

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—It is nearly six p.m. Will you have dinner here?
—Sorry, _______. I have many things to do.[ ]
A. I mustn"t
B. I can"t
C. I needn"t
D. I don"t

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