It is reported that the two armies ____ near the borderline again before dawn.
A. clashed
B. crushed
C. crashed
D. flashed
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I am very much ____ to hear that Mr. Smith is so seriously ill.
A. frightened
B. frustrated
C. disappointed
D. distressed
Louis Herman, at the University of Hawaii, has ____ a series of new experiments to determine the intelligence in some animals.
A. installed
B. formatted
C. devised
D. equipped
There is supposed to be a ____ which serves to give full play to workers' initiative.
A. mechanics
B. machine
C. mechanic
D. mechanism
We should make a clear ____ between the two scientific terms for the purpose of our discussion.
A. separation
B. selection
C. distinction
D. division