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It's reported that in the past 50 years around 80 percent of Beijing's courtyard houses ___________.
| A．had wiped out | B．have wiped out |
| C．had been wiped out | D．have been wiped out |
After she considered the problem, she got a tall box to stand ________.
| A． on | B．up | C．above | D．by |
The changes in the city will cost quite a lot, ___________they will save us money in the long run.
| A． or | B．since | C．for | D．but |
—I hear Jane has gone to the Holy Island for her holiday.
—Oh, how nice! Do you know when she______________?
| A． was leaving | B． had left | C． has left | D． left |
Selecting a mobile phone for personal use is no easy task because technology____ so rapidly.
| A． is changing | B．has changed | C．will have changed | D．will change |
It was __________ back home after the experiment.
| A． not until midnight did he go | B． until midnight that he didn’t go |
| C． not until midnight that he went | D． until midnight when he didn’t go |