A： You must be really excited about leaving for America tomorrow， Li Ping!
B： Yeah． （66）______
A： Nervous about what？
B： I don't know many of the customs and manners in the USA． （67）______
A： Sure．
B： （68）______
A： Well， it's important to be on time when you're invited for dinner．（69）______Americans expect their guests to be on time．
B： Then how long may I stay there？
A： （70）______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． Cold 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．