4. 当我们参观博物馆时应该放低音量。

We shouldwhenwe visit the museum.

3. 他们对彼此都足够礼貌。

They areeach other.

2. 排队等候是一种很好的礼仪。

a good manner.

五、完成句子。(25分)

1. 在公共场合大笑是不礼貌的。

impolite.

5. He is too young to go to school.(同义句转换) 

He isn’t go to school.

3. You should drop litter everywhere.(改为否定句) 

You litter everywhere.

2. They like to talk about the weather to start a conversation.(对画线部分提问) 

do they to talk about to start a conversation?

7. The girl didn’t know where she could find her mother.(同义句转换) 

The girl didn’t know where her mother.

四、按要求改写句子，每空一词。(15分)

1. They greet each other by shaking their hands.(对画线部分提问)

do they each other?

10. You should always try to avoid (cross) this street in rush hours.