题目内容

You have already tried your best, so you ______ worry about the matter.

A. can't
B. needn't
C. mustn't
D. couldn't

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The fire spread through the building very quickly but everyone ______ get out.

A. had to
B. would
C. could
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Please don't make so much noise. I ______ hear the speaker very well.

A. needn't
B. can't
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——Let's climb to the top of the tower.——You _____ be joking! I've been afraid of high places since I was a kid.

A. should
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I ___n’t see, now I _.I _n’t listen, now I _.He _ seem happy, but he _ be sad.You _ be kind. You _ do your best.Can and could. Will and would.May and might, ought to and should.You don’t _ walk, no you _n’t.I’m _ drive, yes I can.We have to, we ___ obey the traffic lights.We can go on green, but we mustn’t on red.Don’t have to and needn’t.Able to and can.Have to and must.Mustn’t and can’t.Modal verbs.