There are three ______ students on the playground.
#50978
A
hundred
B
hundreds of
C
hundred of
D
hundreds
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The rainstorm killed __________ people at year.
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A
two thousand
B
two thousands
C
two thousand of
D
two thousands of
Tibet has been a part of China since _________ years ago.
#51678
A
hundred
B
seven hundreds
C
hundreds of
D
seven hundred of
—How many students are there in your school?—_______ students, I think. 
#51431
A
Thousand of
B
Three thousands
C
Three thousand
D
Three thousands of