根据对话内容从方框内所给的选项中选出最佳答案，使对话完整,符合逻辑，句意通顺，注意有多余选项。 A.It's good to stay at home for you. B. After the meal, don't leave at once. C. Could you give me a hand? D. What rules do they have in America? E. But I'm a bit nervous. F. You're supposed to leave before the meal. G. It's impolite to arrive late. A: You must be really excited about leaving for America tomorrow, Li Ping! B: Yeah. 1 A: Nervous about what? B: I don't know many of the customs and manners in the USA. 2 A: Sure. B: 3 A: Well, it's important to be on time when you're invited for dinner. 4 Americans expect their guests to be on time. B: Then how long may I stay there? A: 5 Or you seem to have come only for the meal. When your friends seem to be getting tired and running out of things, it's time to leave. The next day, call or write a thank-you note to say how much you enjoyed the evening.