改成被动语态1.the shop sells clothes for women

1、The shop sells clothes for women.
Are clothes sold for women by the shop?
2、We have already cleaned the desk.
The desk has already been cleaned by us.
3、How will you post a letter to America?
How will a letter sent to America by you?
4、Did he make Mary unhappy?
Was Mary made unhappy by him?
5、Do the farmers usually grow rice there?
Is rice usually grown by the farmers there?
6、Shall I teach him English?
Shall he be taught English by me?
7、What must we do to save the boy's life?
What must be done by us to save the boy's life?