_______ there are many different types of food, some animals spend their lives eating only one type.
A. Since B. Unless
C. Once D. While
As the Internet has gained popularity, there has been a change in the way ______ people spend their time.
A. which B. in which
C. where D. when
—Which city is the first ________ plastic shopping bags?
—As far as I know, it is San Francisco.
A. banned B. ban
C. banning D. to ban
By the time Dave reached the small boat, a thick white fog _______ over the surface of the water.
A. spread B. has spread
C. had spread D. was spreading
At the root of volunteering is the idea ________ one person may have the ability to offer services that can help other people.
A. that B. what C. which D. /
While many people are excited about these new technologies, these same technologies frighten others. Nowhere __________ truer than with genetically modified (GM) food.
A. there is B. is there
C. is this D. this is
