题目内容

They ___ do well in the exam.

A. can be able to
B. be able to
C. can able to
D. are able to

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-May I take this book out? -No, you___.

A. can't
B. may not
C. needn't
D. aren't

-He_ be in the classroom, I think. -No, he _ be in the classroom. I saw him go home a minute ago.

A. can; may not
B. must; may not
C. may; can't
D. may; mustn't

-Shall I get one more cake for you, Dad? -Thanks, but you___, I've had enough.

A. may not
B. must not
C. can't
D. needn't

Even the top students in our class can't work out this problem, so it ___bevery difficult.

A. may
B. must
C. can
D. need