将下列句子改为被动语态。

1. I sent a letter to you last month.

2. Do we use it for cooking?

3. Where did you build the bridge?

4. Mother tells me a story every day.

5. Can he finish his homework on time?

传统的涂饰工艺被（）新工艺所取代.

A.新技术

B.喷花

C.新材料

D.机械