The most common and grammatically correct completions are "someone" or "somebody," as in "Can't you hear that someone/somebody is knocking at the door?". You can also complete the sentence with a specific noun, such as a name, if you know who it is.
Can't you hear that _________ is knocking the door?
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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.