把下列句子改变成被动语态:
问题描述：
把下列句子改变成被动语态:
1.Leonardo da Vinci painted the Mona Lisa.
2.We can use wood to make a lot of things.
3.They have kept these books in the library for a long time.
4.One of the students will show us around the school.
答
The Mona Lisa was painted by Leonardo da Vinci
Wood can be used to make a lot of things by us.
These books have been kept in the library by them for a long time
We will be shown around the school by one of the students