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Ex1/
1. A loaf of bread is often eaten by me every morning.
2. Five suspects have been arrested by the police.
3. He was ordered to take a long rest by the doctor.
4. Tom wasn't allowed to take these books home.
5. Exercises won't be corrected by the teacher tomorrow.
6. We have been taught French by Mr.Smith for two years.
7. The children were not looked after.
8. This street was not swept last week.
9. A great deal of tea is drunk in England.
10. Two poems were being written by Tom.
11. Tea can't be made with cold water.
12. The meeting will be held before the May Day.
13. The engine of the car has to be repaired.
14. Children's bedrooms are not cleaned every day.
15. Her report had been finished by soon.

Ex4/
1. Letters are written to our friends twice a month.
2. This house isn't sold any longer.
3. A large number of students are being admitted by the school this year.
4. The pollution problems have been discussed by the students since last week.
5. This room has not been used for ages.
6. A new dancing class was started last week.
7. The secretary wasn't phoned by the manager this morning.
8. A big suitcase was being carried by her mother.
9. We were advised not to go out alone.
10. The cheque must be signed by the manager.
11. We used to be made to clean the house by my mother.
12. Fruit has to be picked very early in the morning.
13. Tom is going to be served breakfast.
14. The place had been swept carefully before they went back home.
15. By the end of this year, hundreds of poems will have been written by him.