根据所给句子，选择最佳的应答。每个选项只能用一次。

(      )1.  What are you supposed to do when you meet Japanese?

(      )2.  When were you supposed to pick up Jack?

(      )3.  What did he say?

(      )4.  Let's drop by our teacher's house.

(      )5.  Are you used to staying up?