After waiting for seemed to be a century , a doctor came out from the operation room and informed us everything was OK.
A which B what C it D that
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 |
It may not be a great suggestion. But before ______ is put forward, we will make do with it..
| A．a best one | B．the best one |
| C．a better one | D．a good one |