从方框中选择正确的句子补全对话。
A: What’s wrong with you, Helen?
B:        I have a cold.
A: Bad luck!    
B: Oh, but I’m busy now and I must
finish these exercises in the class.
A:     He will ask you to
have a rest at home.
B:       I don’t want to ask for leave.
A:     You’d better lie down and have a good rest now.
B: OK. I’ll ask for leave at once. Thank you very much.