读一读，补全对话。

A. What about you?            
B. How old is your cousin?

C. Do you have any cousins?    
D. What is his name?
 Ann: Hi! Mike.____
Mike: Yes, I have one cousin.
Ann: ____
Mike: He's 9 years old. ____
Ann: I have one cousin, too. He's a boy.
Mike: ____
Ann: His name is Dan.He is 10 years old.