Bob: Hi! Tom.?
Tom: No, I don't like math. It's difficult. But my father says math is useful.
Bob: Your father is right. Math is useful. I like it. ?
Tom: My favorite subject is P.E. I think it's interesting.
Bob: ?
Tom: Mr. Zhang is our P.E teacher. And he always plays games with us.
Bob: ?
Tom: Yes. It's my basketball. Well, let's play basketball now.
Bob: .
