III.
1. are typically caused
2. were destroyed
3. have been rebuilt
4. will be installed
5. are killed
6. was striken
7. have already been evacuated
8. will be hit
9. are being repaired
10. has been used
IV
1. Letters are typed by Mary in the office
2. I will be help by his father tomorrow
3. Human life has completely changed by science and technology
4. This bottle was broken by Peter
5. English is being learnt in the room
6. My mind can't be changed
7. I hadn't been told about it
8. Her telephone number isn't known by me
9. The children will be brought home by my students
10. I was sent a present last week