The correct phrase is "The house is on fire", meaning the house is burning.The preposition "on" is used when referring to something being in the state of burning or combustion.
Please help someone! The house is _____ fire.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.