I can’t stand ___ with Jane in the same office. She just refuses ____ talking while she works.
| A．working; stopping | B．to work; stopping |
| C．working; to stop | D．to work; to stop |
Every possible means ______to prevent the air pollution, but the sky is still not clear.
| A．are being used | B．have been used |
| C．has been used | D．had been used |
I have no _______ to the plan, so long as it would not cost too much.
| A．refusal | B．comment | C．idea | D．objection |
Don’t use words, expressions or phrases _____ only to people with specific knowledge.
| A．being known | B．having been known |
| C．to be known | D．known |
Scientists still wonder ______ cloning will help or harm us and _____ it is leading us.
| A．that; what | B．whether; where |
| C．if; that | D．whether; how |
After the National Entrance Examination the students will have an anxious couple of weeks _____ for the results.
| A．wait | B．to be waiting | C．waiting | D．waited |