单项选择题
A.Is that all? B.I'm free now. C.It's a pleasure to help D.How should I do it?
A.Are you sure? B.OK.I don't want to be late. C.I'd like one ticket,please. D.Thanks.Could you wait for me?
A.What a pity! B.You konw what I mean. C.I hate to leave. D.But I need the exercise more.