The security guard remained ________, keeping a close eye on the monitor for any suspicious activity during the night shift.
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Worked Solution
Step 1: Understand the role. A security guard is watching for \"suspicious activity\" (danger/threats).
Step 2: Compare nuances. While all words relate to watching, \"vigilant\" specifically means being alert to avoid danger.
Step 3: \"Vigilant\" is the best fit for a security context.
Correct answer: vigilant
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