51.
A. Consider
B. Considering
C. Considered
D. Having considered
52.
A. totals
B. money
C. sums
D. dollars
53.
A. to
B. for
C. by
D. /
54.
A. various
B. variable
C. varied
D. variant
55.
A. from
B. in
C. out of
D. by
56.
A. has learned
B. has been learned
C. is learned
D. can learn
57.
A. is
B. are
C. has
D. was
58.
A. effective
B. efficient
C. more effective
D. effect
59.
A. economic
B. economical
C. economies
D. economy
60.
A. improve
B. improving
C. improved
D. being improved
61.
A. as
B. unless
C. although
D. though
62.
A. that
B. it
C. which
D. /
63.
A. observe
B. observes
C. observing
D. to observe
64.
A. Increasing
B. Increased
C. Increasingly
D. To increase
65.
A. which
B. for which
C. among which
D. of which