根据对话内容，从方框内选择恰当的句子将对话补充完整。（选项中有两项是多余的）

A. I usually play computer games late at night. B. I want to buy some music CDs. C. What's wrong with me? D. Where do you work? E. Stand up and do some exercise from time to time. F. Well, I've got a pain in my back. G. Do you have breakfast?

A: Can I help you?

B:

A: How long have you been like this?

B: Since two weeks ago.

A: Let me have a look.

B: I work in an office.

A: Do you play computer games?

B: Yes, a lot.

A: Mm, that's it.

B:

A: Nothing serious. You spend too much time in front of the computer.

B: What can I do?

A:  Don't play computer games too much.

B: OK, I'll take your advice. Thank you.