难度：★    考点：情态动词

　　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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