（ ）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 

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