Meaning: 'Undeniably' means in a way that cannot be denied or disputed; certainly.

Wrong options:

• havoc: Havoc is a noun meaning widespread destruction or chaos, which does not fit the context of describing a following.
• occurred: Occurred is a verb that does not grammatically fit as it does not modify 'following' and lacks contextual relevance.
• relentless: Relentless is an adjective that describes something persistent, but it does not fit as an adverb modifying 'appreciative.'
• commented: Commented is a verb that does not fit grammatically or contextually as it does not relate to the nature of the following.

Correct answer: relentless

Explanation: The adjective 'relentless' describes the noun 'search,' indicating that the search for perfection is persistent and unyielding. This fits both grammatically and contextually, as it emphasizes the author's dedication to his craft.

Meaning: 'Relentless' means unyielding in severity or strictness; persistent.

Wrong options:

• havoc: Havoc is a noun and does not fit as it does not describe a search or relate to the context of perfection.
• unprecedented: Unprecedented is an adjective that means never done or known before, which does not fit as it does not describe the nature of the search.
• invariable: Invariable is an adjective meaning unchanging, which does not appropriately describe a search that implies effort and persistence.
• commented: Commented is a verb that does not fit grammatically or contextually as it does not relate to the nature of a search.

Correct answer: passionate

Explanation: The adjective 'passionate' describes the noun 'craftsman,' indicating that he is deeply committed and enthusiastic about his craft. This fits grammatically and contextually, as it aligns with the description of his dedication to writing.

Meaning: 'Passionate' means having or expressing strong emotions or beliefs; enthusiastic.

Wrong options:

• havoc: Havoc is a noun that does not describe a craftsman and is irrelevant in this context.
• unprecedented: Unprecedented is an adjective that does not describe a craftsman and does not fit the context of dedication.
• relentless: Relentless is an adjective that describes persistence but does not convey the emotional depth required to describe a craftsman.
• commented: Commented is a verb that does not fit grammatically or contextually as it does not describe a craftsman.

Correct answer: unprecedented

Explanation: The adjective 'unprecedented' describes the noun 'popularity,' indicating that his level of popularity was unmatched or never seen before. This fits grammatically and contextually, emphasizing the uniqueness of his success.

Meaning: 'Unprecedented' means never done or known before; unique.

Wrong options:

• havoc: Havoc is a noun that does not describe popularity and is irrelevant in this context.
• relentless: Relentless is an adjective that describes persistence but does not fit the context of describing popularity.
• invariable: Invariable is an adjective meaning unchanging, which does not appropriately describe the nature of popularity.
• commented: Commented is a verb that does not fit grammatically or contextually as it does not relate to the nature of popularity.

Correct answer: invariable

Explanation: The adjective 'invariable' describes the noun 'habit,' indicating that his drinking habit was consistent and unchanging. This fits grammatically and contextually, as it emphasizes the regularity of his behavior.

Meaning: 'Invariable' means not changing or varying; constant.

Wrong options:

• havoc: Havoc is a noun that does not describe a habit and is irrelevant in this context.
• unprecedented: Unprecedented is an adjective that does not describe a habit and does not fit the context of consistency.
• relentless: Relentless is an adjective that describes persistence but does not fit the context of describing a habit.
• commented: Commented is a verb that does not fit grammatically or contextually as it does not relate to the nature of a habit.