He was a victim of _______.
A. racial discrimination
B. racial equality
C. racial differences
D. racial diversity
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We should take more care of our _____ buildings.
A. diachronic
B. historic
C. history
D. historical
He was taken to a US airbase to be debriefing on the ____
A. mission
B. province
C. employments
D. occupation
It was a _____ decision,and one that everybody admired.
A. easy
B. fast
C. courageous
D. cool
I was so_____ on my work that I didn’t notice the time.
A. intent
B. tired
C. nervous
D. happy