Sometimes_________good knowledge of_________ first aid may mean the difference between life and death.
The medicine works more effectively ________ you drink some hot water after taking it.
Owen wouldn't eat anything ________ he cooked it himself.
You will be successful in the interview ________ you have confidence.
People who are really in need of houses will suffer heavy losses ________ the government takes measures to bring down house prices.
________ hard one may work, one cannot master a foreign language in a month or two.