Home work P.24
The doctor gives advice on health
Advice on health was given by the doctor
Drug companies produce medicines
Medicines are produced by drug companies
Two doctors examined me at the hospital
I was examined by two doctors at the hospital
I broke my leg in accident
My leg was broken by an accident
A Chinese developed acupuncture
Acupuncture was developed by the chinese
Europeans took infectious diseases to America
American diseases were taken by european infectious
