补全对话。 T: Hello, Bill. 1 . B: This after
题型：补全对话，情景问答
问题：
补全对话。
T: Hello, Bill. 1 .
B: This afternoon ? Yes,I am.
T: We're going to have a baseball game. 2 .
B: 3 . But I'm afraid I can't.I have to go to see the doctor.
T: Why? What's the matter?
B: I have a sore back .
T: I'm sorry to hear that. 4 .
B: Sure. 5 .