-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
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-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
The children___ play football on the road.
A. can't
B. can
C. mustn't
D. must
-Must I do my homework at once? -No, you___.
A. needn't
B. mustn't
C. can't
D. may not
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