December is the _______ of the year.
A. twelve
B. twelveth
C. twelfth
D. twenth
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________ of students have finished the homework.
A. Two three
B. Two third
C. Two threes
D. Two thirds
The blue bag is my bag, and the yellow one is ______.
A. she
B. her
C. hers
D. mine
The population of China is larger than ______ of America.
A. one
B. ones
C. that
D. those
_____ is our duty to help others.
A. That
B. It
C. This
D. These