It is the prevention of disease ______its successful treatment that has led to the rapid increase of the world’s population.
Much time _____ sitting at a desk, office workers are generally troubled by health problems.
Schools should be lively places where individuals are encouraged to _____ to their greatest potential.
The number of smokers, _____ is reported, has dropped by 17 percent in just one year.
I’m so ______ to all those volunteers because they helped my terrible day end happily.
A ship in harbor is safe, but that’s not ______ ships are built for.