Tsinghua University,
I think that something has to be done to stop the air from being polluted, ______ ?
| A．doesn't it | B．don’t I | C．don't they | D．haven't they |
It has been reported that some government leaders ______ their authority and position to get illegal profits for themselves.
| A．overlook | B．employ | C．abandon | D．abuse |
Let's learn to use the problem we are facing ______ a stepping-stone to future success．
| A．to | B．for | C．as | D． by |
His novels sell best and have made him famous, but before that no one could have imagined how great a role he ______ in the literary world．
| A．had played | B．has played | C．is playing | D．was to play |
When dealing with students, teachers are supposed to adopt ______ and caring approaches, as they are unique young individuals of different personalities.
| A．abstract | B．efficient | C．flexible | D．effective |