4/ Our teeth should be cleaned twice a day 
5/ The english grammar has been explained by our teachers
6/ The accident was caused by some drunk drivers
7/ Tom's parents will be visited by tom next month
8/ The secretary wasn't phoned by the manager this morning
9/ Was this beautiful dress bought by Mary ?
10/ These old pictures won't be hung in the living room
11/ This factory wasn't built during the Second World War by the German
12/ This house and these cars are going to be painted for Christmas Day by the Greens 
13/ The cats had been fed by Ann before she went to the cinema 
14/ The pollution problems have been discussed by the students since last week
15/ Has the most valuable painting in the national museum been stolen by the thieves 
16/ The new president will be interviewed on TV 
17/ How many languages are spoken in Canada ?
18/ Are those shoes going to be repaired ?
19/ His nose has been broken in a football match 
20/ Have the above sentences been finished ? 

4. Our teeth should be cleaned twice a day

5. The English grammar has been explained by our teachers

6. The accident was caused in this city by some drunk drivers

7. Tom 's parents will be visited by Tom next month

8. The secretary was not phoned by the manager this morning

9. Was this beautiful dress bought by Mai?

10. These old pictures won't be hung in the living room
11. This factory wasn't built during the Second World War by the German
12. This house and these cars are going to be painted for Christmas Day by the Greens 
13. The cats had been fed by Ann before she went to the cinema 
14. The pollution problems have been discussed by the students since last week
15. Has the most valuable painting in the national museum been stolen by the thieves 
16. The new president will be interviewed on TV 
17. How many languages are spoken in Canada ?
18. Are those shoes going to be repaired ?
19. His nose has been broken in a football match 
20. Have the above sentences been finished ?