根据人教新目标版九年级英语unit11《Could you please tell me where the restroom》完成下列句子，每空词数不限。

1. It is a very common and necessary activity to _____________.

2. Knowing _____________ is important.

3. We should change _____________we speak when talking with different people.

4. The expressions you use might depend on ___________ you are speaking to or __________ you 

    know them.

5. If you stop a stranger in the street, we might first say "Excuse me. __________" or "I'm sorry to 

    trouble you but," before asking them for help.

选出下列句子中加点词与例句中加点线词意思相同的一项是（  ）

例句：一日，大母过余曰

A．是谁之过与？

B．臣有客在市屠中，愿枉车骑过之

C．人往，从轩前过

D．今先王之爱民，不过父母之爱子