单项选择题
A.Wow,it is great!Thank you. B.You shouldn't have bought it. C.It must be very expensive. D.That's good.How much is it?
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?