The wealth of a country should be measured ________ the health and happiness of its people as well as the material goods it can produce.
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Sorry sir, we don't have wine or beer. We are only licensed to sell _______ drinks.
Be careful, _______ you'll fall down.
Since William had been seriously ill for several months, his parents were worried about________ to return to school full-time.
It was three British sportsmen who ________ banned drugs.
Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.