—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
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Our planet is about ______ years old.
#51853
A
35,000
B
4600
C
4600 million
D
500 million
There're            students in Grade7. 
#51655
A
three hundreds
B
three hundreds of
C
three hundreds'
D
hundreds of
I have         classes today .         class is P.E.
#51412
A
eight , English
B
eight , The eighth
C
eighth , The eighth
D
eighth , English