完成下面的对话。 a. They're too expensive. b. I like brown. c. How much are they? d. Yes. I'd like to buy a pair of shoes. e. No. I don't like the colour. A: May I help you? B: 1. A: These shoes are nice. Would you like them? B: 2. A: What colour do you like? B: 3. A: Do you like these shoes? These shoes are brown. B: 4. A: They're 100 yuan. B: 5. A: What about these shoes. These shoes are on sale. They are only 50 yuan. B: I'll take one pair of these shoes.