[ Grammar ]
Research has shown that there are more than 4000 species __________ frogs around the world.
A. in
B. on
C. of
D. off
Select your answer:
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A. some
B. any
C. a lot of
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If we don’t do something now, the birds are going to ______ soon
A. die of
B. die with
C. die out
D. die on