Scientists have discovered amazing evidence showing how the human body rebuilds _______ while we sleep.
A. us B. ourselves C. it D. itself
—Why didn’t you remind him of the possible danger?
—But what _______ otherwise? He never listens to me.
A. could I do B. could I have done C. should I do D. must I have done
The new means of transport ________ in this city, so whether it will work out remains to be seen.
A. have never tried B. has never tried C. have never been tried D. has never been tried
It wasn’t until then _______ their marriage was breaking up because they had little in common.
A. did I realize B. that I realized C. had I realize D. when I realized
The earthquake in Japan, measuring 9.0 on the Richter Scale, was so violent _______ cause a series of explosions of the nuclear reactors in several power stations.
A. to B. that C. as to D. as that
By the time you arrive home, I _______, so please don’t make any noise when you come in．
A. have been sleeping B. would have slept C. had slept D. shall be sleeping
