He failed the final examination and only then ____ how much time he had wasted.
A. he realized B. had he realized
C. he had realized D. did he realize
Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land, thus _____it less fertile.
A. make B. to make
C. made D. making
When the area was _______ by the flood, the government organized people to send food and medicine there immediately.
A. cut away B. cut down
C. cut off D. cut up
People should ______the traffic rules when they travel to a new place. Nobody can be exception.
A. perform B. observe
C. possess D. support
So far, some advanced teaching equipment, together with three hundred new books, ______ to those schools in the faraway area.
A. has been sent B. have been sent
C. was sent D. were sent
That was _____ time when girl’s education was always placed ____ second to boy’s.
A. a; a B. the; the C. /; / D. a; /
