It’s going to be some time _____ he sees his father again, _____ business has just been started in Switzerland．
| A．after; who | B．before; whose | C．when; whose | D．since; who |
Although Beijing didn’t establish its first Antarctic research base until 1985, Chinese efforts _________ its influence across the continent are now outpacing other nation’s plans.
| A．expanding | B．to be expanded |
| C．expanded | D．to expand |
So far, Mike has spent about $28,000 on the house and __________ it to cost about $38,000 when it is finished and furnished.
| A．expected | B．expects |
| C．has expected | D．will expect |
When effectively _______, the feedback we share with students or employees can develop their awareness of their own learning.
| A．managing | B．being managed |
| C．managed | D．to manage |
We all can feel something unusual about Kate, but she just _________ let us know what it is.
| A．shouldn’t | B．mustn’t |
| C．needn’t | D．won’t |
I can’t imagine what air we would be breathing in if we __________ anything to stop air pollution.
| A．hadn’t done | B．didn’t do |
| C．haven’t done | D．don’t do |