根据对话的情景，从方框中选择适当的句子填在画线处，使对话完整通顺.
A: Hello! May I speak to David, please?
B: This is David. Who’s that?
A:     
B: Hello, Li Lei.     
A: I’m doing my homework.
B: I think you are learning physics.
A: Yes. You’re right.     
B: Because physics is your favourite subject.
A: David, we want to play soccer this afternoon.    
B: Yes, I’d love to.    
A: We want to meet on the playground at 1:00 p. m. See you then. Bye.
B: Bye-bye.

A. When and where will we meet? B. Why do you think so? C. Would you like to come with us? D. This is Li Lei. E. What are you doing?