—Look at the sign!

—Oh, I see.We _______ waste water.

A. can　　　　　 B. must　　　　　　 C. mustn’t　　　　 D. needn’t

— Must I return the book this week?

— No, you ____. You can _　 it for 20 days.

A. mustn't: keep B. needn't; borrow　 C. needn't; keep　　　 D. mustn't; borrow

—Do you know the song Come on, Haixi!—Yes, and I _________sing it well.

A. must B. can C. need

—Must I return the hook tomorrow morning?

—No, you _ .You can keep it longer.

A. mustn't　 B. can't 　　 C. needn't 　　D. couldn't

—Hey, Ted! You _______ never play in the street. It’s not safe.

—Sorry, Mum. I won’t again.

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

 —________ I smoke here?

—No. You are not allowed to smoke in public places.

A. Could    B. Must   C. May   D. Might

—Another cup of tea?

—No, thanks. I_______ be off. Gina is waiting for me.

A. can B. must C. may

 You look quite tired. You’d better ______ a good rest.

  A. stop to have       B. stop having      C. to stop to have  D. to stop having

— _______ we clean the classroom at once?　

— No, you _______. You _______ clean it after school.

A. Must; needn’t; may B. Must; mustn’t; can.

C. Shall; can’t; must D. Need; mustn’t; may

-- May I go out now, Dad?

-- No. You let your mother know first.

　　 A. can B. may C. need D. must