1:Letter are typed in the office by Mary 

2:You will be helped by his father tomorrow

3:Human life has been completely changed by science and technology

4:This bottel was broken by peter 

5:English is being learned in the room by them 

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:A present was sent to me last week 

11: We more information were given 

12:All the workers 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 hold before May Day 

16 : The engine of the car have to be repaired

17:The window was broken and some pictures were taken away by the boys 

18:A lot of money is spent on advertising everyday 

19:A story is going to be told by teacher 

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