Sure! Here are the sentences converted from the active voice to the passive voice:

1. Proper encouragement is always given to me by my parents.
2. I remember being given a toy drum by someone on my fifth birthday.
3. I was asked some difficult questions at the interview.
4. Let this switch not be touched.
5. You won’t be allowed to do that silly thing again by him.
6. I rarely hear her children being called bad names by her.
7. A terrible mistake seems to have been made by someone.
8. I think Tom should have been offered the job.
9. It is said that a bank was robbed by Arthur a long time ago.
10. Little boys used to be made to climb the chimneys to clean them.
11. That money has been sent to the poor families by them.
12. She loves being praised by someone all the time.
13. You need to have your hair cut (passive form stays the same as it's already a structure indicating passive).
14. The first steam-engine was invented by Stephenson.
15. Was the first steam-engine invented by Stephenson?
16. Bread is not made by a butcher.
17. Is bread made by a butcher?
18. He was forgiven by his father.
19. Was he forgiven by his father?
20. My little brother is often taken to the kindergarten by Mother.
21. This piece of music was composed by Beethoven.
22. The bridge was carried away by the storm.
23. A bicycle is promised to me by Rather.
24. The news was told to me by Nam this morning.
25. The old pagoda was pointed out to me by the guide.
26. I was lent this book by Lan.
27. These books must not be taken away.
28. Is he spoken well of?
29. Lessons should be made more interesting for children.
30. He was invited to dinner yesterday.
31. He was told to wait outside.
32. The work must be finished.
33. Something must be done for those poor men.
34. The light was left on all night.
35. Milk is used for making butter and cheese.
36. Is milk used for making butter and cheese?
37. A pupil is praised when he works hard.
38. Progress is made every day in the world of science.
39. I was not told the truth about the situation.
40. The bridge was being repaired.
41. Was the house built in 1960?
42. I was not invited to the tea-party.
43. It will be installed by her boyfriend.
44. The museum will be visited by millions of people.
45. The contract will be signed by our boss.
46. Sue won't be seen by him.
47. The window was opened by Anna.
48. The picture can be cut out by him.
49. A lot was eaten by the sheep.
50. Our house is being painted by my father.
51. Some food was being bought by my sister at 11 a.m. yesterday.
52. A pencil is used by my brother to draw beautiful pictures.
53. Dinner is being prepared by her mother in the kitchen.
54. Was this beautiful dress made by Mary?
55. These old pictures won’t be hung in the living room by me.
56. This factory was not built by the Germans during the Second World War.
57. This house and these cars are going to be painted by the Greens for Christmas Day.
58. The pollution problems have been discussed by the students since last week.
59. Has the most valuable painting in the national museum been stolen by the thieves?
60. The new president will be interviewed on TV by some people.
61. How many languages are spoken in Canada?
62. Are those shoes going to be repaired?
63. His nose has been broken in a football match.
64. Have the above sentences been finished by you?
65. This story was told to them by their grandmother when they visited her last week.
66. This train ticket was ordered for his mother by Tim.
67. The special cameras were not shown to me by you.
68. Her ticket was shown to the airline agent by her.
69. His friend is lent his new shoes by him.
70. Five million pounds were left to her relatives by her.
71. These boxes were handed to the customer by the shop assistant.
72. The first prize was awarded to the reporter by the board.
73. Have the Christmas cards been sent to your family?
74. Alice was appointed secretary for the meeting by the committee.
75. The broken cup is hidden in the drawer by him.
76. The party was voted a great success by them all.
77. Some bananas and some flowers were given to Ann by us.
78. The fridge was moved into the living room by them.
79. Some cups of tea were brought to the visitors in the next room by her.
80. The new project is found worthless by them.

Let me know if you need anything else!