选择方框中适当的选项补全对话。 A: What can I do for you? B: 1_ ______ _ A: What size do you want? B: 2_ _______ A: What color do you like? B: 3_ _______ A: Which would you like, the woolen (的) ones or the cotton (棉的) ones? B: 4_ _______ A: What about this one? B: Oh, it's great. How much is it? A: Fifty yuan. B: 5 ________ A. I like blue. B. That is a good idea . C. I'd like a sweater for my son. D. Size'L'. E. Hmm. That's cheap, I'll have it. F. I'll have a look at the cotton ones.