—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

—Must I clean my room now, Mum?

—_______. You can do it tomorrow.

A．No, you needn’t                       B．No, you mustn’t

C．Yes, you need                          D．Yes, you must

—Mr. Wang, must I come again to clean the window on Sunday morning?

—No, you _____ . I have asked others to do it.

A．don’t have to     B．mustn’t          C．can’t            D．shouldn’t

Dear Jack,

How are you? I have been in the USA for six months. I like the life here. I have a few friends. I don’t have much homework. There are a lot of sports at my school, but I don’t like sports at all. I like the food very much. I eat a lot of different kinds of food every day. I like coke（可乐）very much. I don’t drink water. I drink coke instead（代替）. I’m enjoying my life here. The sad thing is that sometimes I get ill. I don’t know why. My parents say I must go on a diet and do more sports. Must I?

Yours,

David

1. David has been in America for six months.

2. David has to do much homework.

3.There are many sports at David’s school.

4.David likes coke better than water.

5.David knows why he is often ill.

—Must I finish my homework now, Mom?

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

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