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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.
Who among the following person sits 2nd to the right of the one who sits opposite to S?
What is the position of E with respect to F?
Four of the five among the following are similar in such a way to form a group, who among the following doesn’t belong to the group?
...How many persons attend the seminar between M and his daughter?
If counted from the left of T, how many persons sit between T and Z?
Who sits third to the left of T?