Question

he crept in his parents should wake up

Answer 1

He crept in _______ his parents should wake up.

A. Unless

B. Whereby

C. Otherwise

D. Lest

answer is otherwise 

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Answer 2

Answer :

This question is based on conjunctions.

The correct sentence is :

He crept in lest his parents should wake up.

Cambridge English Dictionary defines 'conjunction' as 'a word such as 'and', 'but', 'while', or 'although' that connects words, phrases, and clauses in a sentence.'

Cambridge English Dictionary defines the conjunction 'lest' as 'in order to prevent any possibility that something will happen.'