_______ human beings use it in a wrong way, like we did with nuclear technology, the advancement of science and technology has never led to decline of human development.
A. While B. Unless
C. As long as D. Before
—I’m afraid the project may be several days behind schedule due to bad weather.
—Don’t worry. Three more assistants will be _______ in no time at all.
A. at your convenience B. at your command
C. at your risk D. at your request
Ding Junhui plays _______ Gary Wilson in the semifinal of the 2015 World Snooker China Open in Beijing, April 4, 2015.
A. over B. for C. against D. with
—Mum, Dad ought to stop working?
—Yes, he has a bad headache because he _______ too long.
A. read B. has been reading
C. had read D. is reading
After the death of her mother, the girl was sold to a rich man just in the neighboring area, from _______ house she tried to escape twice.
A. whom B. his C. whose D. which
It is of great importance _______ parents say and do in family life, which may have a life-long effect on their children.
A. what B. that C. how D. why
