A. an
B. a
C. the
D. 不填
( )13. The problem of pollution in this city is more serious than ______ in other cities.
A. that
B. it
C. this
D. those
( )14. Dick found himself walking _______ the direction of the post office.
A. to
B. by
C. along
D. in
( )15.that we were late, we started to run.
A. Know
B. To know
C. Knowing
D. Being known
( )16. This room is _______ any of the others in the building.
A. the biggest than
B. big as
C. bigger than
D. the biggest of
( )17. Just think Ann got the house _______ all by herself!
A. paint
B. be painted
C. to paint
D. painted
( )18. The policeman caught the man the arm.
A. by
B. with
C. on
D. at
( )19. To get an education,
A. one must work hard
B. working hard is important
C. to work hard is necessary
D. it is needed to work hard
( )20. The old man could not decide the money or to put it in the bank.
A. if he spent

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