Select the most appropriate option that can substitute the underlined segment in the given sentence to improve it. If no improvement is required, select ‘No improvement required’.
The pollution level ought to keep under control.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. ought to be kept.
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Correct Structure: The phrase “ought to be kept” correctly uses the passive voice, which is appropriate when discussing something that should be managed or maintained by someone.
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The passive voice is needed here because the sentence implies that the pollution level should be controlled by an external action (i.e., by people or authorities), not that the pollution level itself performs the action.
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“Ought to be kept” is the correct form.
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It uses “be” with “kept” to form the passive construction, indicating that the pollution level should be managed or controlled.