根据上下文补全对话内容。
A: Hi, John. You didn't come to school yesterday afternoon. What was wrong with you?
B:1.______.
A: I'm sorry to hear that. 2.______?
B: Much better. But I still cough and I feel weak.
A: 3.______?
B: Yes, I have. I went to the doctor's last night. The doctor gave me some medicine
and asked me to stay in bed for three days.
A: 4. ______?
B: Because I'm afraid I'll miss more lessons and fall behind.
A: Don't worry about that. 5.______.
B: It's very kind of you to say so. Thanks a lot.
A: You're welcome.
