Scientists think that there has been life on Earth for _______ years.
#51626
A
illions
B
millions of
C
illion of
D
illion
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Our school is so famous that _______ people come and visit it every term.
#51663
A
hundred
B
hundreds
C
hundred of
D
hundreds of
This is river. Few of us can swim it, I think.
#51656
A
a 800-foot-wide; over
B
an 800-foot-wide; across
C
a 800-feet-wide; over
D
an 800-feet-wide; across
There are about two _________students in our grade.
#51342
A
thousand
B
thousands of
C
thousand of
D
thousands
More than two _______years ago, people knew little about the universe.
#51657
A
thousands
B
thousand
C
thousands of
D
thousand of
_____ of the water _____ polluted. We must try to protect our environment.
#51088
A
Two third; are
B
Two third; is
C
Two thirds; are
D
Two thirds; is