基本语法。
根据对话填入所缺的单词。
A: 1._____ can I do_____you?
B: Yes, please.1 want an overcoat.
A: What 2._____ do you want?
B: White and yellow.
A: 3._____do you want?
B: A size large.
A: What about this one?
B: 4. _____is it?
A: 20 yuan.
B: OK. I'll take it.5_____.
A: You're welcome.