8. The house (was built) of brick.
9. How many questions (were asked) after the lecture?
10. The new president (will be elected) by the end of the year.
11. The letter (was torn) into pieces.
12. This rare phenomenon (is observed) every ten years.
13. The potatoes have already (been boiled), the meat (is being roasted) now.
14. The baby (is looked after) by the babysitter.
15. Not all the disadvantages (were carefully considered) at the conference.
16. The landscape (was painted) very artistically.
17. Children's behaviour (is influenced) by TV.
18. Fortunately, nobody (was injured) in the car crash.
19. His ideas (have been talked about) by people for many years by now.
20. The life boat (has been called out) five times for the last two months.
21. A few attempts (have been made) so far.
22. When the light (was turned on), we saw a body on the floor.
23. I see his attitude to life (is being reviewed) now.
24. Unfortunately the mistake (was made) again.
25. First, one shot (was scored), then a second, and a third.
26. By the end of the last year the show (had been watched) by two million people.
27. Sometimes stamps (are sold) at incredible prices.
28. The patient (is being examined) by the doctor at the moment.
29. By next September the novel (will have been written) for a decade already.
30. His status (is believed) to be privileged.