从下面的方框中选择适当的句子填空，使对话完整。

A: May I come in?
B:    Oh, it’s you, Li Ping. Show me your homework first.
A: Sorry, Mr. Wang. I was not at school yesterday.
B:     
A: Something was wrong with my left leg.
B: I’m sorry to hear that.    
A: Yes, it’s a little better.
B: You’d better finish your homework this evening.   . It’s bad for your eyes. You can show it to me tomorrow. You must look after yourself and keep healthy.
A: Yes, Mr. Wang. I must finish my homework after school today.