Difficulty: Easy
Correct Answer: spell
Explanation:
Given data
Concept/Approach
The standard collocation in English is a spell of warm/cold/dry weather.
Option analysis
spell — correct fixed collocation: “a spell of warm weather.” ✅time — too generic; not an idiomatic fit.length — measures extent; not idiomatic for weather.phase — used for stages, not typical with weather.
Final Answer
spell
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