题目内容

Please don't make so much noise. I ______ hear the speaker very well.

A. needn't
B. can't
C. shouldn't
D. mustn'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
B. may
C. can
D. must

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.

fill in the blanks with proper words and phrases

简述半合成红霉素的结构改造方法