There are three ________ students in their school.
#51852
A
thousands of
B
thousand of
C
thousands
D
thousand
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Eight ________ students in our school are from countryside.
#51194
A
hundreds
B
hundred
C
hundreds of
D
hundred of
Our planet is about ______ years old.
#51853
A
35,000
B
4600
C
4600 million
D
500 million
 It is said that the gravity on Mars is only about __________ of the gravity on earth.
#50894
A
three-eighths
B
third-eighth
C
three-eighth
D
third-eighth
There are   floors in my house and my bedroom is on the______floor.
#51500
A
three; two
B
three; second
C
two; third
D
second; three