In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Tobacco kills four million people a year, one death every _ seconds.

A: eight
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Q: Stroke is our nation's number _ killer, and a leading cause of disability for older adults.

A: three
****
Q: Distilled water enters the body with _ minerals but leaves the body with minerals.

A:
no
****