Nearly 200 of the 1500 native plant species in Hawaii are at risk of going extinct in the near future because they have been (66) _______ to such low numbers.
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There are many different ways of comparing the economy of one nation with those of another.
A B C D
Most doctors agree that it is not good for patients to lay in bed without exercising.
A B C D
They are known that colds can be avoided by eating the right kind of food and taking exercise regularly.
A B C D