根据情景完成对话 Rosa: Do you have black bags? Mr.Smith: No, 1 we have blue bags. Do you like these? Rosa: 2 ,I do. How much are they? Mr.Smith: They're thirty 3 . Rosa: Oh, that's too dear. How about twenty dollars? Mr.Smith: That's OK. Rosa: 4 the money. Mr.Smith: 5 you.