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. _____