Ⅳ.补全对话
根据下面的对话情景,在每个空白处填上一个适当的句子,使对话的意思连贯、完整。
A: Hello! May I speak to David, please?
B: This is David. Who's this?
A: 1. ______.
B: Hello, Li Lei. 2. ______?
A: I'm doing my homework.
B: I think you must be learning physics.
A: Yes, you're right. 3. ______?
B: Because physics is your favorite subject.
A: David, we want to play soccer this afternoon. 4. ______?
B: Yes, I'd love to. 5. ______?
A: Let's meet on the playground at 1:00 p. m. See you then. Bye.
B: Bye-bye.

1. This is Li Lei
2. What are you doing
3. Why do you think so
4. Would you like to play soccer with us
5. When and where shall we meet