Hard as an adverb means with great effort. Hardly means barely (opposite meaning). Hardness is a noun. Hard and fast is an idiom meaning strict. So hard correctly completes the sentence.
Choose the correct 'adverb' to complete the given sentence:-
The patient fought very ________ to survive.
Held on 22 Jun 2023 · Verified 13 Jul 2026.
hardly
hard
hardness
hard and fast
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