To ensure the safety of the hikers at Bukit Timah Nature Reserve, the guide reminded them to remain ________ and look out for loose rocks along the treacherous path.
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Worked Solution
Step 1: Understand the context. The path is "treacherous" (dangerous) and there are "loose rocks".
Step 2: Analyze the options. "Vigilant" means keeping careful watch for possible danger or difficulties. While "attentive" and "observant" are similar, "vigilant" is the most precise collocation for watching out for danger.
Answer: vigilant
Correct answer: vigilant
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