根据对话内容，从对话后方框的选项中选出能填入空白处的最佳选项，使对话意思完整，并将答案写在答题纸相应位置。选项中有两项为多余选项。
补全对话
Ling ling: I’m going to England as an exchange student.
Mary: Great!
Ling ling: But I don’t know much of the customs and manners in England. __36____
Mary: Sure.
Ling ling: ________37__________
Mary: Well, they think it’s important to be on time when you’re invited to dinner. _____38___ .As it is usually planned to have the meal at the exact hour given in the invitation.
Ling ling: Then how long may I stay there?
Mary :___39_ .Or you seem to have come only for the meal .An evening dinner invitation usually implied (暗示)that ___40__. The hostess often plans some after—dinner entertainment .

A. you stay for the whole evening B. Could you help me? C. After the meal is over, it’s not polite to leave at least half an hour. D. It’s impolite to arrive late. E. What rules do they have in England? F. What’s the matter with you ? G. What are they supposed to do ?