The problem was that it is ___ valuable ___everyday use.
| A．too; to | B．too; for | C．too; of | D．so; that |
．No sooner ________ down on bed ________ the telephone rang.
| A．had he lain; than | B．had he lied; when |
| C．did he lie; than | D．had he laid; before |
________ about wild plants that they decided to make a trip to Madagascar for further research.
| A．So curious the couple were |
| B．So curious were the couple |
| C．How curious the couple were |
| D．The couple were such curious |
Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________？
| A．isn't it | B．does it |
| C．doesn't it | D．is it |
A series of stimulus policies and supportive measures taken by the government ________ to promote change in the economic environment in this area.
| A．are expecting | B．are expected |
| C．is expecting | D．is expected |
Only when he returned ________ that the war had ended and the army had come back.
| A．we tell | B．we told |
| C．did we tell | D．were we told |