51.
A. try
B. tried
C. trying
D. having tried
52.
A. automatically
B. accidentally
C. tremendously
D. usually
53.
A. changed
B. located
C. developed
D. copied
54.
A. by
B. up
C. about
D. to
55.
A. forms
B. is consisted of
C. composed of
D. includes
56.
A. read
B. reading
C. reads
D. being read
57.
A. on
B. in
C. of
D. at
58.
A. car maker
B. policeman
C. doctor
D. operator
59
A. via
B. near
C. by
D. besides
60
A. assists
B. causes
C. makes
D. helps
61
A. number of
B. deal of
C. amount of
D. volume of
62
A. writer
B. reporter
C. expert
D. leader
63
A. already
B. long ago
C. long before
D. shortly
64
A. although
B. nevertheless
C. however
D. if
65.
A. city
B. year
C． person
D. country