There are four ________ students in our school.
#51641
A
hundred
B
hundreds
C
hundreds of
D
hundred of
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I don’t know what ________ of students in that school is, but you can see there are _________ of bikes and e-bikes outside the gate.
#51734
A
a number, the number
B
a number, a number
C
the number, a number
D
the number, the number
Our planet is about ______ years old.
#51853
A
35,000
B
4600
C
4600 million
D
500 million
Our teacher said there would be ______ books in the new library.
#51524
A
thousand
B
thousands
C
thousands of
D
thousand of
Computers of today can work         than the ones in the 1970s.
#51505
A
hundred of times faster
B
a hundred time faster
C
hundred times faster
D
hundreds of times faster
_________trees have been planted near, so the air is very fresh.
#51259
A
Hundreds of
B
Hundred of
C
Two hundreds
D
Hundreds