Fill in the blank suitable model from the options given below:
Walk fast lest you ___________ fail.
A
may
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B
should
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C
might
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D
would
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Solution
The correct option is B should
Option B: The only auxiliary verb that can follow 'lest' is 'should'. They're a fixed pair and 'should' cannot be replaced by another verb. The expression 'lest you should...' means 'or else you will'.
Hence the correct option is B: should.
Options A, C and D: 'May', 'might' and 'would' are auxiliary verbs that do not follow the conjunction 'lest'.