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My answer:

31. I will be taken to Ho Chi Minh city by my father next week.

32. The keys were returned to me by a man. 

33. Mary's friends will be seen off at the station.

34. A large hole was being dug in the ground by workers. 

35. A way is being found to solve the problem by countries. 

36. Tea can't be made with cold water. 

37. All the workers of the plan were being instructed by the chief engineer.

38. Some of my books have been taken away.

39. The meeting will be held before May Day. 

40. The engine of the car has to be repaired. 

41. The window was broken by the boy and some pictures were taken away. 

42. I was told about it by a man I know. 

43. His story isn't believed.

44. Is English taught here? 

45. Will she be invited to your wedding party? 

46. Were some exercises given by the teacher? 

47. Has the window of the laboratory been changed? 

48. Are big cakes being made for the party by her? 

49. Why wasn't he helped? 

50. This machine mustn't be used after 5.30 pm. 

51. This machine must be cleaned very time you use it. 

52. Your car will be driven to London on Tuesday. 

53. You will be send your examination results when they are ...

54. In this August, a new house will be built. 

55. He can be given good marks by the teacher because he is an excellent student. 

56. Soft drinks will be served. 

57. "War and Peace" was written by Tolstoy. 

58. "Hamlet" was written by Shakespeare. 

59. "Hamlet" wasn't written by Hemingway. 

60. That house was built in 1930.

I don't copy anyone's answer!