Put these sentences into the passive voice

7. The bank manager kept me waiting for half an hour.

--> I was kept waiting for half an hour by the bank manager.
8. Has he spelt this word wrongly?

--> Has this word been spelt wrongly by him?
9. All his friends will see him off at the airport.

--> He will be seen off at the airport by all his friends.
10. They used to drink beer for breakfast in England years ago.

--> Beer used to be drunk for breakfast in England years ago.
11. Someone might have sent the letter to the wrong address.

--> The letter might have been sent to the wrong address.
12. They were cleaning the floor when I arrived.

--> The floor was being cleaned when I arrived.
13. They are digging the hole on the wrong side of the road.

--> The hole is being dug on the wrong side of the road.
14. They are going to steal your money if you're not careful.

--> Your money is going to be stolen if you're not careful.
15. Has anyone ever asked you for your opinion?

--> Have you ever been asked for your opinion
16. Alan's knowledge of art doesn't impress me.

--> I am not impressed by Alan's knowledge of art.
17. How do people make candles?

--> How are candles made?
18. They can't make tea with cold water.

--> Tea can't be made with cold water.
19. When is someone going to announce the results of the contest?

--> When are the results of the contest going to be announced?
20. Nobody informed the police that there had been a mistake.

--> The police weren't informed that there had been a mistake.
21. Where will your company send you next year?

--> Where will you be sent by company next year?
22. Who looked after the children when you were away?

--> By whom were the children looked after when you were away?
23. Look! Someone is feeding the seals.

--> Look! The seals are being fed.
24. Kathy had returned the book to the library.

--> The book had been returned to the library by Kathy.
25. By this time tomorrow, the president will have made the announcement.

--> By this time tomorrow, the announcement will have been made by the president.
26. The pollution in the city was affecting people's breathing.

--> People's breathing was being affected by the pollution in the city.
27. Mrs Andrews hasn't signed those papers yet. Has Mr Andrews signed them yet?

--> Those papers haven't been signed by Mrs. Andrews yet. Have them been signed by Mr. Andrews yet?
28. Is a student pilot flying that airplane?

--> Is that airplane being flew by a student pilot?
29. Where did they hold the 1988 Olympic Games?

--> Where was the 1988 Olympic Games held?
30. Do they make those tractors in this country, or do they import them?

--> Are those tractors made in this country, or are they imported?