Experts say that the _______ of the world could be ...

[ Vocabulary ]

Experts say that the _______ of the world could be over 7 billion by the year 2015.

A. number

B. population

C. rate

D. quantity

Select your answer:

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I looked everywhere for my glasses but I _________________ find them anywhere.

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Since the researchers did not come to the correct conclusion, they restructured their hypothesis, and they will attempt the experiment again.

A. Simple

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