Question

    (A) This arrangement was expected to / (B) assure a sufficient change in air to keep / (C) such railways properly ventilated, but experience / (D) has proved it to be ineffective for the purpose.

    A A Correct Answer Incorrect Answer
    B B Correct Answer Incorrect Answer
    C C Correct Answer Incorrect Answer
    D D Correct Answer Incorrect Answer

    Solution

    Assure means “to tell someone that something will definitely happen.” Ensure means “to make sure of something.” Here it should be ensure in part B of the sentence.

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