The poor man , ________，ran out of the dark cave.
| A．tiring and frightened | B．tired and frightened |
| C．tired and frightening | D．tiring and frightening |
As is known to us all, under no circumstances______ temporary economic development at the expense of the environment and resources.
| A．should we seek | B．we should seek |
| C．we had sought | D．had we sought |
We don’t care if a hunting dog smells _____, but we really don’t want him to smell ____.
| A．well, well | B．bad, bad | C．well, badly | D．badly, bad |
The present question is ____ many students consider it impossible ____ is really possible if effort is made.
| A．what; that | B．that ; that | C．that; what | D．what; what |
Some very common things such asto the sun for a long time will do harm to people's skin and even cause skin cancer
| A．exposing | B．being exposed | C．having exposed | D．exposed |
you may have , you should gather your courage to face the challenge .
| A．However serious a problem | B．Whatever serious a problem |
| C．However a serious problem | D．No matter how a serious problem |