III. Rewrite the following sentences in the passive voice.

26. A cake can't be made without sugar.

27. Many accidents are caused by dangerous driving.

28. Coffee was being made when the light went out.

29. We haven't been told the news.

30. The man who stole your money hasn't been arrested by the police.

31. About a million puppies are thought to be born each year.

32. When was this hotel built?

33. This room is cleaned everyday.

34. Your car might have been stolen if you had left the keys in it.

35. The bank near our house has been robbed. 

36. She hasn't invited to the party.

37. They has been driven to the airport.

38. Their complaints should be sent to the head office.

39. The game is being introduced to students.

40. Three men are said to have been arrested after the explosion.