The correct completion is Only, which fits grammatically and logically, meaning that just a few insect sounds are audible to humans, with most being too high or too low in pitch.
______ a few of the sounds produced by insects can be heard by human.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.