第6部分：完形填空(第51～65题，每题1分，共15分)
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
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