51.
A. for
B. to
C. about
D. with
52.
A. like
B. alike
C. resembled
D. similar
53.
A. on
B. from
C. up
D. in
54.
A. use
B. heat
C. pressure
D. form
55.
A. creation
B. invention
C. discovery
D. recognition
56.
A. retain
B. keep
C. hold
D. set
57.
A. did
B. built
C. tried
D. conducted
58.
A. weak
B. gentle
C. hard
D. strong
59.
A. or
B. however
C. though
D. even
60.
A. capable
B. probable
C. practical
D. possible
61.
A. experiments
B. checks
C. discoveries
D. works
62.
A. form
B. place
C. shape
D. size
63.
A. on
B. to
C. in
D. with
64.
A. system
B. style
C. way
D. direction
65.
A. everything
B. anything
C. nothing
D. something