Select the most appropriate option to fill in blank number 1.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. by.
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The word "by" is the most appropriate choice for blank number 1.
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The phrase "everyone lives by selling something" indicates that selling is the means by which individuals sustain their livelihood or existence.
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It suggests that selling is an inherent aspect of life through which people derive their income or resources.
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Therefore, "by" is the correct preposition to convey this idea.