选择正确的句子,完成对话。 (5')
W : Good 'morning. （1）
M: Yes. I'd like a pair of pants for my son.
W: Here are the pants. What colour does your son like?
M: He likes blue. （2）
W: Look at this pair. Do you like it?
M: （3） Do you have any big pants?
W: Yes. How about this pair?
M :It's nice. （4）
W: （8）0 yuan.
M : Too expensive. What about 70 yuan?
W:Well. （5） . Here you are.
M : Thanks.