The air in Tibet(西藏) is cleaner than ________ in our city.
A. one
B. the one
C. that
D. those
He has two assistants. One is from China and ________ is from Japan.
A. others
B. another
C. the rest
D. the other
December is ________ month of a year.
A. ten
B. eleven
C. twelve
D. the twelfth
China has a ________ population than ________ country.
A. large, any
B. larger, all
C. larger, any other
D. larger, other
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