The drug used to treat this disease causes bad side effects, some of which ________ deadly.
A．is B．are
C．was D．were
．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
