While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.
A. is tried B. are tried
C. has been tried D. have been tried
Talk to anyone in this country ________ you will find education and food safety are the problems of top concern.
A. thus B. or C. then D. and
The trees ___________ down in the storm have been moved off the road.
A. being blown B. blown
C. having been blown D. blowing
Although he is a well-known star, he never gives others an impression that he is _________ those who play with him.
A. more inferior than B. more superior than
C. inferior to D. superior to
I don’t know what happened to my pet. It just ________ eat whatever I feed her.
A. don’t B. won’t C. can’t D. couldn’t
We are all aware _________ the many threats _________ the environment and we need to take action to prevent us from the bad consequences.
A. of; to B. of; on C. that; to D. that; on
