补全对话

Mary：Hello！ May I speak to Li Lei？

Li Lei： 1

Mary：Hi, Li Lei. What are you going to do this afternoon？

Li Lei：I'll have classes this afternoon. 2 ？

Mary：I need help. If you can't come, can you tell Peter for me instead？

Li Lei：OK. 3 , please. I'll see if he is in.(A moment later) Sorry, he is not in at the moment.

Mary：Oh. Can you tell him to ring me up when he comes back？

Li Lei： 4 . Does he know your number？

Mary：I'm not sure. Just write down my number and give it to him.

Li Lei：OK. I will leave a message on his desk.

Mary： 5 . Goodbye！

Li Lei：Bye-bye.