选择适当的句子补全对话。 a. How much would you like ? b. Is that all ? c. How much are these things ? d. May I help you ? e. How many do you want ? A: Good morning, sir. B: I'd like to buy some peas, please. A: B: Half a kilo, please. A: OK. Here you are, B: No. And some tomatoes, please. A: B: Four, please. A: Here you are. B: Thank you. A: Let me see, 3 yuan 80 fen. B: OK. Here's the money. A: Thank you.