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    Question

    Brimstone is easily burned without any extraneous help;

    (A)/indeed the only precaution required is (B)/to take care lest the heat produced by (C)/the burning sulphur shall not volatilize (D)/part of it in the unburned state (E).
    A ABCE Correct Answer Incorrect Answer
    B BCDE Correct Answer Incorrect Answer
    C ABDE Correct Answer Incorrect Answer
    D None of the above given combinations. Correct Answer Incorrect Answer
    E The sentence is correct Correct Answer Incorrect Answer

    Solution

    When the subordinate clause comes after 'lest', the auxiliary Verb 'should' must be used, whatever be the Tense of the Verb in the main clause. So here, ‘shall’ is to be changed to ‘should’. Brimstone is easily burned without any extraneous help; indeed the only precaution required is to take care lest the heat produced by the burning sulphur should not volatilize part of it in the unburned state.

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