I got out of the taxi, ___ the fare and dasked into the station.
| A．paying | B．paid | C．to pay | D．having paid |
___________ I am willing to go, I would like it better if you went.
| A．How | B．Where | C．While | D．If |
. He removed the tree ____________ it was the best in the ground.
| A．when | B．if | C．because | D．as |
. The young man，who by then admission to university，decided to do some part-time jobs to gain more practical experience．
| A．gained | B．was gaining | C．has gained | D．had gained |
We work together to achieve our common purpose：_________world that is safer, cleaner and healthier than one we found．
| A．the；the | B．a；不填 | C．a；the | D．the；不填 |
Boris has brains. In fact, I doubt whether anyone in the class has ____ IQ.
| A．a high | B．a higher | C．the higher | D．highest |