从方框中的选项中选出合适的句子补全对话。(填序号)

A. I'm tired all day at work. B. What's the matter with you? C. Well, I'll try that. D. How long have you been like this? E. And don't drink too much tea at night.

A: Hello, young man.

B: I just couldn't sleep.

A:

B: Er, for a month.

A: Don't worry. But go to bed at the same time every night, and get enough exercise.

B: Ah... Why?

A: You'll be all right soon.

B: Thanks a lot.

A: You're welcome.