Complete the sentence using a suitable preposition and mark your answer in the response sheet.
I filled the tank, but unfortunately I filled it __________ the wrong kind of fuel.
Kerala PSC KAS - 2025,
Answer: C
The preposition is with: I filled it with the wrong kind of fuel.
The verb fill takes with before the substance put into the container: fill a glass with water, fill the tank with petrol. The sentence follows the same pattern.
Filled it in means completing a form or a gap, a different phrasal verb. On does not combine with fill in this sense, and by introduces the doer or the means of an action, not the material that fills something, so none of them fits.
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