用恰当的单词填空，完成对话，每空一词。

A: Good morning, doctor.

B: Morning. What's your problem, madam?

A: It's my son. He's not feeling  1 . He coughs badly and can't sleep at night.

B : How long has he been  2  this?

A: For two days.

B: Does he have a  3 ?

A: No, I took his temperature an hour ago and it seemed all right.

B: Let me check him  4 . I think he has caught the flu.

A : Is it serious, doctor?

B: Don't  5 . Take the medicine and drink plenty of water. He'll be better soon.

A: Thank you.

1. _____     2. _____     3. _____     4. _____     5. _____