Difficulty: Easy
Correct Answer: Till
Explanation:
Given data
Concept/Approach
Till (or “until”) indicates duration up to a point in time and fits before a noun phrase: “Till the arrival of …”.
Option analysis
Till — correct: “Till the arrival of the police.”Unless — conditional, not temporal.Although — concessive, wrong relation.Even — an adverb; incomplete without “until.”
Final Answer
Till
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