難度：★ 考點(diǎn)：情態(tài)動(dòng)詞
1. The old people must______ to politely.
A. are spoken B. spoken C. speak D. be spoken
2. -Whose shoes are these?
-They _____ be Mike's. They are much too large for him.
A. might B. may C. mustn't D. can't
3. You ____be servious! You're actually going to lend him money again?
A. needn't B. can't C. shouldn't D. mustn't
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