Meaning: 'Renowned' means famous or celebrated, particularly for a specific skill or quality.

Wrong options:

• differentiated: The term 'differentiated' is an adjective that means distinguished or set apart, which does not appropriately describe artists in this context.
• imposed: 'Imposed' is a verb that means to force something upon someone, which does not fit as a descriptor for artists.
• hire: 'Hire' is a verb that refers to employing someone, which does not grammatically or contextually fit as a description of artists.

Correct answer: leading

Explanation: The term 'leading' is an adjective that describes the top or most important researchers in the field of nanotechnology. It fits grammatically as it modifies 'researchers' and contextually highlights their significance in the book.

Meaning: 'Leading' refers to those who are at the forefront of their field, indicating prominence and expertise.

Wrong options:

• involved: 'Involved' is an adjective that means engaged or participating, which does not specifically denote the prominence of the researchers.
• differentiated: 'Differentiated' does not fit as it implies distinction rather than leadership in the field.
• imposed: 'Imposed' is a verb that does not fit as it does not describe researchers and their role.

Correct answer: involved

Explanation: The word 'involved' is an adjective that describes the science that is engaged or included in the discussions about nanotechnology. It fits grammatically as it modifies 'science' and contextually indicates the complexity of the subject matter.

Meaning: 'Involved' means engaged or included in a particular activity or situation.

Wrong options:

• renowned: 'Renowned' does not fit here as it describes fame rather than the nature of the science.
• leading: 'Leading' does not apply to science itself but rather to the researchers, making it contextually inappropriate.
• differentiated: 'Differentiated' implies distinction, which does not accurately describe the nature of the science discussed.

Correct answer: envision

Explanation: The verb 'envision' means to imagine or visualize something in the future. It fits grammatically as it serves as the main verb of the clause and contextually aligns with the idea of readers picturing future scenarios presented in the book.

Meaning: 'Envision' means to imagine or foresee something, particularly in a creative or conceptual way.

Wrong options:

• involved: 'Involved' does not fit as it describes engagement rather than the act of imagining.
• renowned: 'Renowned' is an adjective that does not serve as a verb and does not fit the context of visualizing the future.
• differentiated: 'Differentiated' does not apply as it does not relate to the act of imagining or visualizing.