Kate ________ on her new novel, which is supposed to come out next month.
| A．was working | B．had worked |
| C．will be working | D．has been working |
Honestly speaking, I would agree with Shirley, though not ______.
| A．entirely | B．widely |
| C．possibly | D．eventually |
Every possible means ______ to prevent the air pollution, but the sky is still not clear.
| A．has been used | B．have been used |
| C．is used | D．are used |
My father and my mother have been married for 30 years, and never once ______ with each other.
| A．they have quarrelled | B．did they quarrel |
| C．had they quarrelled | D．have they quarrelled |
Although the old man was ______ death, he still fought with the disease bravely.
| A．at the end of | B．on the top of |
| C．at the edge of | D．on condition that |
Many countries are increasing their use of natural gas, wind and other forms of ______.
| A．energy | B．power | C．force | D．strength |