51.
A. of
B. on
C. at
D. by
52.
A. take
B. forget
C. feel
D. make
53.
A. stopped
B. created
C. called
D. mentioned
54.
A. soon
B. early
C. late
D. timely
55.
A. work
B. play
C. program
D. pain
56.
A. class
B. punishment
C. treatment
D. home
57.
A. doctors
B. teachers
C. parents
D. classmates
58.
A. good
B. useful
C. wrong
D. handy
59.
A. because
B. although
C. unless
D. so
60.
A. to
B. at
C. in
D. as
61.
A. though
B. whether
C. thus
D. how
62.
A. them
B. him
C. us
D. you
63.
A. numbers
B. studies
C. cases
D. parts
64.
A. stomach
B. head
C. heart
D. mind
65.
A. support
B. aid
C. assist
D. help