20) No one believes his story.
=> His story isn't believed
21) A sudden increase in water pressure may break the dam.
=>The dam may be broken by a sudden increase in water pressure
22) We must take good care of books borrowed from the library.
=> Books borrowed from the library must be taken good care of.
23) A man i know told me about it.
=>I was told about it by a man I know .
24) We can never find him at home for he is always on the move.
=>He can never be fould at home for he is always on the move
25) They use milk for making butter and cheese.
=>Milk is used for making butter and cheese.
26) Science and Technology have completely changed human life.
=>Human life has been changed completely by Science and Technology.
27) John used to visit My Cole at weekends.
=> My Cole used to be visited by John at weekends.
28) Weeds cover the river bank.
=> The river bank is covered by weeds