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

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