根据上下文补全对话     Jack: Hello!     1    
Tom: Sure. Wait a minute.
Mary: Hello.     2     
Jack: This is Jack speaking. Mary, my mother is ill.  So I must stay at home to look after her.
Mary:      3     What can I do for you?
Jack: Would you like to tell Miss Gao that I can"t go to school this afternoon?
Mary:      4    
Jack: Thanks.
Mary:      5    
1.            2.              3.              4.              5.