---Must I do the work today? 

---No, you ____. You may do it tomorrow.

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

— Must I do the rest of the work today?
— No, you _________  finish it tomorrow.

 — Must I do the rest of the work today?

— No, you _________  finish it tomorrow.

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

A: Hi, Darren. Do you like riding your bike around the city?

B:    1.   Cycling can help us save energy, and it’s easy to park the bike.

A: I agree, but I don’t like cycling at all.

B: Why?

A:    2.   What must I do if I want to go cycling?

B: First, you should never ride too fast.

A: That’s easy, I’ll ride slowly.   3.  

B: Second, you can wear bicycle helmet(头盔) when

riding.

A:    4.   What else?

B:    5.   And you should also learn more about

the traffic rules.

A: I see. I’ll buy a bicycle and have a try next week.

—Must I do my homework now?

—No, you _______. You can do it tomorrow.

A. mustn’t              B. don’t             C. needn’t