根据对话情景,补全对话。 A: 1______ sir? B: Yes,I'm looking for a silk shirt which goes with my trousers. A: This way please. 2______ B: I like light blue. Does it match my trousers? A: 3______ B:A size large. A: 4 ______ You may try it on in the dressing room. B: 1 will take it.5______ A: It's about ninety-nine dollars. B: Here you are. Thank you. A: What size do you want? B: Here you are. C: What color do you prefer? D: What can I do for you? E: How much is it?