Here’s the text transformed into passive voice:

1. Tea cannot be made with cold water.
2. All the workers of the plant were being instructed by the chief engineer.
3. Some of my books have been taken away by somebody.
4. The meeting will be held before May Day.
5. The engine of the car has to be repaired.
6. The window was broken by the boys, and some pictures were taken away.
7. A lot of money is spent on advertising every day.
8. This room may be used for the classroom.
9. A story is going to be told by the teacher.
10. The cake is being cut with a sharp knife by Mary.
11. The women with a red hat were looked at by the children.
12. The victims have been provided with food and clothing.
13. English is spoken in almost every corner of the world.
14. This machine must not be used after 5:30 p.m.
15. I was not called by them, luckily for me.
16. After class, the chalkboard is always erased by one of the students.
17. The wall must be cleaned before it is painted.
18. The new pupil was told where to sit by them.
19. I knew that he had been told of the meeting.
20. I have never been treated with such kindness.
21. His story is not believed by anyone.
22. A sudden increase in water pressure may be caused by the dam to break.
23. Books borrowed from the library must be taken care of by us.
24. I was told about it by a man I know.
25. He can never be found at home for he is always on the move.
26. Milk is used for making butter and cheese.
27. Human life has been completely changed by science and technology.
28. My Cole was visited by John on weekends.
29. The river bank is overrun by weeds.
30. The room was filled with smoke.