根據(jù)對話填入所缺的單詞。 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.