The __________ of his books among parents and the recommendation of experts both at home and abroad have quickly made him a celebrity educator.
As the Internet has gained popularity, there has been a change in the way ______ people spend their time.
—Which city is the first ________ plastic shopping bags?—As far as I know, it is San Francisco.
By the time Dave reached the small boat, a thick white fog _______ over the surface of the water.
At the root of volunteering is the idea ________ one person may have the ability to offer services that can help other people.
While many people are excited about these new technologies, these same technologies frighten others. Nowhere __________ truer than with genetically modified (GM) food.