根据对话内容从所给的选项中选出最佳答案，使对话完整，符合逻辑， 句义通顺。注意：有多余选项。 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. 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