根据对话内容，从右边方框中的六个选项中选出五个合适的句子补全对话。

A: Hello, Mr. White!

B: Hello, David.You look worried and sad.

A:I really need your help.

B: What do you mean?

A:But since I entered Grade Nine, my parents haven't allowed me to play basketball.

B: Maybe they are right.

A: I see. But I do well in my lessons and I think they should allow me to do the things that I'm interested in.

B: Ok.

A: Thank you! You're very kind.

A. Work must come first. B. I'll talk with your parents about the problem. C. You can ask your parents to buy you a basketball. D. What's wrong with you? E. Well, the problem is that I love basketball. F. I have a problem.