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 join us 5. When and where shall we meet