5. Some film stars ___ difficult to work with.
B. are said to be

6. Today, many serious childhood diseases ___ by early immunization.
C. can be prevented

7. Do you get your heating ___ every year?
D. checked

8. All bottles ___ before transportation.
C. were frozen

9. The telephones ___ by Alexander Graham Bell.
D. was invented

10. They've already ___, sir. They're on your desk.
D. been typed

11. Sarah is wearing a blouse. It ___ of cotton.
C. is made

12. They had a boy ___ that yesterday.
A. do

13. We got our mail ___ yesterday.
B. delivered

14. Mr. Wilson is ___ as Willie to his friend.
A. known

15. Have you ___ by a dog?
C. ever been bitten

16. The room is being ___ at the moment.
B. cleaned

17. It ___ that the strike will end soon.
A. is expected

18. It is ___ that many people are homeless after the floods.
C. reported

19. He was said ___ this building.
B. to have designed

20. Parrots and crows ___ the most intelligent birds.
B. are considered