Here are the responses to your questions:
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What is an author’s tone?
- their attitude toward a subject
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How do the words racket, sauntering, and smirked impact the paragraph’s overall meaning?
- They imply the narrator considers the adventure a joke.
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What is a word’s connotation?
- the feeling the word gives the reader
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What is etymology?
- a word’s origin and how its meanings have changed over time
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What is the origin of the phrase caveat emptor?
- Latin