I'd only use two commas (style 3) if the quote were too large to manage otherwise or if there were semantic confusion; for this case, I think I'd choose: Liz said "Everyone's doing a great job" to motivate her students.
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AnonymousHe would not use the words "mix," "dilute," and "combine" in the sentence but would rather use the word "mixing."
When you are writing about words, use either italics or single quotes.
He would not use the words 'mix', 'dilute', and 'combine' in the sentence but would rather use the word 'mixing'.
He would not use the words m