根据对话内容，在每个空白处填写一个适当的单词。

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 call Peter for me instead?

Li Lei：OK．Hold on, please．I'll see(3)________ he is in．(A moment later)Sorry, he is not in at this moment．

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

Li Lei：All right．Does he know your(4)________?

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

Li Lei：OK．I will(5)________ a message on his desk．

Mary：Thanks a lot．Good bye!

Li Lei：Bye-bye．