补全对话，根据对话内容，从方框中选择适当的句子填入空白处，使对话完整。（有两项多余）
A: You must be really excited about leaving for America tomorrow, Li Ping!
B: Yeah.____
A: Nervous about what?
B:I don't know many of the customs and manners in the USA.____
A: Sure.
B:____
A: Well, it's important to be on time when you're invited for dinner.____Americans expect their guests to be on time.
B: Then how long may I stay there?
A:____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 to leave before the meal. G. It's impolite to arrive late.
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CO2+2H2O B．2H2+O2