—Dad, may I watch TV? －No, you can't. You _______ finish your homework first. [ ]A. must B. can

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• —____ you play the piano?— No. But I can play the guitar. [ ]A. Can B. May C. Must D. Should -九年级英语
• —Who is that man?—That _______ be Mr. Green. He always walks this way. Hi! Mr. Green. [ ]A. can B. m
• —I can't stop smoking, doctor. —For your health, I'm afraid you ______. [ ]A. may B. can C
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• —______ you play football? —No. But I'm good at playing basketball. [ ]A. Must B. CanC. May D.
• —We______talk loudly when we see the sign "Be quiet" on the wall. —Yes, you are right. We
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• —Look at the sign! —Oh, I see. We ______ waste water.[ ]A. can B. mustC. mustn'tD. needn't
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