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    Question

    Select the most appropriate option that can substitute

    the bold segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’. The teacher advised him to ( keep an eye at) his younger brother.
    A keep eyes on Correct Answer Incorrect Answer
    B keep an eye in Correct Answer Incorrect Answer
    C keep an eye on Correct Answer Incorrect Answer
    D No substitution required Correct Answer Incorrect Answer

    Solution

    The correct idiomatic expression is “keep an eye on”, meaning to watch carefully. Other prepositions are incorrect.

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