As a teacher, he knows exactly how to his ideas to the students.
To their relief, the doctor told them that if proper _______, Betty could recover very soon.
_______ there are many different types of food, some animals spend their lives eating only one type.
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.