Here are the completed sentences:
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25 is a whole number and would be a finite decimal.
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−0.07 is a rational number and would be a finite decimal.
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49 is a whole number and would be a finite decimal.
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99−−√ is an irrational number and would be a non-terminating decimal.
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−0.03521... is a rational number and would be a non-terminating decimal.
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121−−−√ is a whole number and would be a finite decimal.