Помогите, пожалуйста с английским по пассивному залогу.

Passive Voice
1. Преобразуйте следующие предложения из действительного залога в страдательный.
1. I published the article two years ago. 2. They use this uniform only to work in the garden. 3. The woman switched on the light and closed the door. 4. They will answer you in a week. 5. Who painted this picture? 6. The girl showed her friend how to do the exercise. 7. They have looked for the letter everywhere. 8. Nobody had visited us. 9. We will have papered the room by 12 tomorrow. 10. The boy hasn’t slept in his bed. 11. Some people don’t look after their pets

У меня вот так получилось, но не знаю правильно ли и последние два вообще не пойму как сделать
1.The article was published by me two years ago.
2.This uniform was used to work in the garden by them
3.The door was closed and light was switched on by women.
4.The answer will be send in a week.
5.Picture was painted by whom?
6.The exercise was shown how to do to friend by girl
7.The letter have been looked everywhere by them.
8.We hadn’t been visited by anybody.
9.The room have been prepared by 12 tomorrow by us.