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Here's how the sentences are converted into passive voice:

1. The car was designed by him.
2. The computer is used by most people.
3. The service will be provided by them.
4. The problem has been caused by you.
5. The window will be smacked on by Mr. Brown.
6. They have been told.
7. The job has been done by her.
8. The dog is kept in the garden.
9. Dinner was given to her by the grandparents.
10. The book had been read.
11. The book by Christopher Columbus is being read.
12. The temple was built in Poland.
13. Essays must be handed in by students on time.
14. The homework will be written by the teacher.
15. Men are wanted by women.
16. The steps to mankind were started by them.
17. My time is taken up by them.
18. Lunch is being cooked.
19. Cars are wanted by people.
20. Two boxes in Poland are chosen.
21. Exams are not liked by students.
22. Cakes were delivered.
23. The dinner is being eaten by her.
24. Sue has been phoned by me.
25. The house has been tidied by them.
26. The electricity was turned off because Mr. Dixon hadn’t paid the bills.
27. No books in Germany have been chosen.

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