[解析]
W:Hello,this is Mary speaking.Who's that?
M:It's me,Peter.
W:Oh Hello,Peter.Whom do you want to speak to?
M:Can I speak to John?
W:No,you can't speak to him now.
M:Isn't he in rightnow?
W:Yes,he is in,but he is very busy.
M:What is he doing?May I know?
W:He is getting ready for school.Grandmother is combing his hair.Sister is looking for his coat.Mother is putting textbooks into his schoolbag.Goodbye.I've got to go now.I am holding the door open.The school bus is coming.
M:In that case,I'll ring him again this afternoon.Bye.
W:See You I'll tell him that.