Adverbs act as modifiers within the sentence structure, alt...
(__) "Much" and "far" are grammatically correct intensifiers for comparative adjectives (e.g., "much better").
(__) "Very" can modify strong or ungradable adjectives like "exhausted" or "freezing".
(__) "Hardly" is an adverb of manner meaning "with a lot of effort" or "energetically".
(__) The adverb "enough" must always follow the adjective or adverb it modifies (e.g., "good enough").
The correct sequence, from top to bottom, is: