Michael Phelps is ________ active young man from the U.S.A.A. a B. an C. the
Mr.Brown always makes his class________and keeps his students________in class.
Computers________widely in our daily life.
Many houses________in the earthquake of April 20,2013 in Ya’an.
—What languages________in that country?—German and English.
Battery-operated slippers are used________seeing in the dark.