11.Some people who are very intelligent and successful in their fields find _______ difficult to succeed in language learning.
A. which
B. how
C. that
D. it
12.The Ocean is more than 4000 miles _______.
A. wider
B. widest
C. wide
D. in wide
13.Now you can see _______ you should consult the dictionary last， not first.
A. which
B. what
C. why
D. how
14.In one type of laboratory test all the variables _______ one are controlled.
A. by
B. and
C. but
D. or
15.Small _______ it is， an atom can still be seen.
A. that
B. as
C. so
D. where
16.They think in getting their materials， and also in _______ them，and in plastering them together with mud.
A. arranging
B. arrange
C. being arranging
D. arranged
17.I am in favor of his proposal that a special committee _______ to examine the problem.
A. set up
B. was set up
C. be set up
D. is setting up
18.It has long been assumed _______ aggression is caused by male hormones.
A. what
B. that
C. which
D. who
19.The actor was almost _______ most audience before he played that part.
A. known of
B. unknown to
C. known for
D. unknown for
20.The fixed star was _______ a planet.
A. made of
B. made from
C. made up for
D. mistaken for
