The correct answer is Option (2) - Should
- "Should" is the most appropriate word here, as it is used to seek permission or offer advice, especially in more polite or formal contexts.
- "Will" can be used to express willingness for future actions.
- "Must" is used for necessity or obligation, which is not appropriate here.
- "Do I switch the air conditioner on?"
- This phrasing is incorrect in this context. "Do" would generally be used in questions about habitual actions (e.g., "Do I usually switch the air conditioner on?") or when seeking confirmation about facts, neither of which fits here.
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