put he following nto the passive
1. They have sold their car to pay their debt
2. People have developed many different paper products
3. Wastes from chemical factories have caused a lot of pollution
4. They have just given the children some gifts
5. People have used the ballpoint pens for many years
6. We haven't finished our homework yet
7. they haven't collected the rubish
8. he hasn't written novels for ages
9. we haven't used these rooms for a long time
10. Lan hasn't visited her grandparents since last year
11. have terrorists attacked many cities in the world for months?
12. Has anyone shown you the new machine?
13. Has the author written a special edition for children?
14. Have thay chaned the date of the meeting?
15. Have the two countries established friendly relations?
16. He asked me many difficult question
17. She advised us to reuse milk bottles
18. They made the fire in the traditional way
19. He finished his exercises on time
20. This boy broke my window yesterday
21. The lawyer gave him the details of his uncle's will