补全对话。 Shop assistant(店员): 1. Duoduo: I want a hamburger. Shop assistant: Sorry. We don’t have hamburgers now. But we have sandwiches. 2. Duoduo: Yes, please. 3. Shop assistant: Ten yuan for two. Duoduo: 4. Shop assistant: Here you are. Duoduo: 5. Shop assistant: You’re welcome.