1.Letters are typed in the office by Mary

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 in the room

6.My mind can not be changed

7.I had not been told about it

8.Her telephone number isn't known

9.The children will be brought home by my students

10.A present was sent me last week

11.more information was given to us

12.All the workers of the plan were being instructed by the chief engineer

13.Tea can't be made with cold water

14.Some of my books have been taken away

15.The meeting will be held before May Day

16.The engine of the car has to be repaired

17.The window was broken and some pictures were taken away

18.A lot of money is spent on advertising every day

19.A story is going to be told by the teacher

20.A cake is being cut with a sharp knife by Mary

21.The woman with a red hat was looked at by the children

22.The victims have been provided with food and clothing

23.English is spoken in almost every corner of the world