Studies show that people are more to suffer from back problems if they always sit before computer screens for long hours.
Although she is only 17 years old, she _________ drugs for two years.
The great success of this program has been largely _____ the support given by the 10 local business men.
He risked __________ his job to see me off.
I was ashamed _________ lied to my mother.
Doctors are doing research to find out what happens physically when people _________ smoking.