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
【小题1】 David has been in America for six months.
【小题2】 David has to do much homework.
【小题3】There are many sports at David’s school.
【小题4】David likes coke better than water.
【小题5】David knows why he is often ill.

—Must I go with you?

—No, you ________.

－ Must I clean my rabbit’s hutch every day?

         － No, you ____________.

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

—Must I finish my homework now, Mom?
—No, you _______.You can do it tomorrow.
A.  can’t                    B.  needn’t                C.  mustn’t

— Must I return the book tomorrow?

— No, you ________. You can keep it for three days.

A．mustn’t          B．needn’t          C．can’t            D．may not