The 20th century has witnessed an enormous worldwide political, economic and cultural _____.
A. transformation
B. transportation
C. transmission
D. transition
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The statistical figures in this paper are not _____. You should not refer to them.
A. vigorous
B. accurate
C. rigid
D. fixed
It is necessary for a qualified teacher to have good manners and _____ knowledge.
A. intense
B. tense
C. intensive
D. extensive
It has been reported that some officials _____ the authority and position to get illegal profits for themselves.
A. exploit
B. abuse
C. overlook
D. employ
Something unexpected happened in my company when I was on vacation, and the situation required that I ______ there, so I had to end my vacation.
A. am
B. be
C. being
D. been