( )1. —Have you seen our English teacher?
—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
( )2. We _______ play football on the street. It’s too dangerous.
A. can’t B. can C. mustn’t D. must
( )3. —Must I do my homework now?
—No, you _______. You can go to play with your friends for a while.
A. needn’t B. mustn’t C. can’t D. may not
