1.Tea can't be made with cold water.
2. The chief engineer was instructing all the workers of the plant.

-> all the workers of the plan were being instructed by The chief engineer

3. Somebody has taken some of my book away.

-> some of my book have been taken away

4. They will hold the meeting bofore May Day.

->the meeting will be held bofore May Day.

5. They have to repair the engine of the car.

-> the engine of the car has to be repaired

6. The boys broke window and took away some pictures.

->the window was broken and some pictures were taken away by the boys

7. People spend a lot of money on advertising everyday.

-> a lot of money is sent on advertising everyday.

8. They may use this room for the classroom.

-> this room may be used for the classroom.

9. The teacher is going to tell a story.

->a story is going to be told by the teacher

10. Mary is cutting the cake with a sharp knife.

-> the cake is being cut with a sharp knife by Mary.
11. The woman with a red hat was looked at by the children.
12. The victims have been provided with food and clothing.
13. The lesson is explained by the teacher.
14. The food is being cooked in the kitchen by Mrs. Green.
15. The patients were examined by the doctor.