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      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 тАЬto tell someone that something will definitely happen.тАЭ Ensure means тАЬto make sure of something.тАЭ Here it should be ensure in part B of the sentence.

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