—Why didn't you try your best to get on the bus?—I tried to, but it had started moving ________ I could get on it.
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.