A: You must be really excited about leaving for London tomorrow, Judy!

B: Yeah.____

A: Nervous about what?

B : I don't know many of the customs and manners in UK.____

A : Sure.

B:____

A: Well, it's important to be on time when you're invited for dinner.

____ The British 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 sleepy 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.

分析课文《秋天的怀念》中母亲的形象，寄托了作者怎样的感情？

甲车速度18米/秒，乙车速度72千米/小时，甲、乙车速度较大的是 ____车．

如图所示,在△ABC中,∠C=90°,DE⊥AB于D,BC=BD,结果AC=3cm,那么AE+DE=(   )