The correct word to fill in the blank is at. The completed sentence is: "They will arrive at 5 PM". This is because "at" is used for specific times of the day.
They will arrive _____ 5 PM.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.