7. C. have all the machines been tested?
8. D. Does he realized that he is being laughed at?
9. D. B and C are correct.
10. A. We found that the soccer had been cancelled.
11. A. A cake is being cut with a sharp knife by Mary.
12. B. Was this play written by Shakespeare?
13. D. Which book is loved by the students?
14. D. How many slums are going to be cleared?
15. A. By whom was the report on the air pollution written?
16. B. By whom was President John Kennedy killed?
17. B. By how many students is the bookself being carried?