I/

1. The letters are typed by Mary in the office

2. You will be helped by his father tomorrow

3. Human life has been changed by science and technology

4. This bottle was broken by Peter

5. English is being learned by them in the room

6. Nothing can be changed by my mind 

7. I had been told by no one about it

8. 

9. The children will be brought home by my students

10. A present was sent last week

II/

2. My car was stolen 

3. The students are being watched by their teacher do the homework

4. You will not be done by him do that silly thing

5. The children is worked hard 

6. He was worked by them all they

7. The woman was seen by the detective putting the jewelry in her bag

8. The hotages were lay down by the terrorists

9. Drivers are advised by the police to use an alternative route

10. I am helped by her to do all these difficult exercise