It is every citizen’s duty to go out to ______ the snow on the street______ it stops falling so as to make it convenient for traffic to pass．．
A．sweep up; the instant B．clear up; the moment
C．clean up; immediately D．whirled up(卷走); directly
The sight of the ruined temple ______ him of the time when he was trapped but______ to escape from it through a narrow opening in the quake.
A．called up; was able to B．informed; tried
C．reminded; succeeded D．reminded; managed
It will be some years before some foreign doctors change the impression they have _____Chinese medicine, _____, in their opinion, is nothing but raw herbs（药草） and not effective at all in treating diseases．
A．for; which B．on; what C．to; that D．on; which
________confidence and the necessary equipment, they failed to rescue the 42 miners trapped in the coal mine．
A．Lack of B．Lacking of C．Lacking D．Having lacked
______ many times, he finally understood it.
A．Told B．Telling
C．Having told D．Having been told
The pilot asked all the passengers on board to remain______ as the plane was making a landing.
A．seat B．seating C．seated D．to be seating
