A.I. Explanation:

Correct answer: track

Explanation: The verb 'track' fits grammatically as it describes the action linguists take in relation to the evolution of language. It aligns with the context of monitoring or following changes over time, which is the main focus of the sentence.

Meaning: 'Track' means to follow or monitor the progress or development of something.

Wrong options:

• assign: The verb 'assign' means to allocate or designate, which does not fit the context of following the evolution of language.
• light: The word 'light' is a noun and does not fit grammatically as a verb in this context.
• gather: The verb 'gather' means to collect or assemble, which does not convey the specific action of following changes in language.
• mass: The noun 'mass' refers to a large body or quantity, which does not fit the action required in this context.
• pick: The verb 'pick' means to choose or select, which does not relate to the action of tracking language evolution.
• zero: The verb 'zero' means to focus or direct attention, but it does not convey the action of following or monitoring.

Correct answer: zero

Explanation: The verb 'zero' fits grammatically as it describes the action of focusing on specific aspects of regional variations. It aligns with the context of linguists concentrating their studies on particular elements.

Meaning: 'Zero' means to focus in on something with precision or attention.

Wrong options:

• assign: The verb 'assign' does not fit here as it implies allocating tasks rather than focusing on variations.
• light: The word 'light' is a noun and does not fit grammatically as a verb in this context.
• gather: The verb 'gather' means to collect, which does not convey the specific action of focusing on variations.
• mass: The noun 'mass' does not fit as it does not relate to the action of focusing on language variations.
• pick: The verb 'pick' means to choose, which does not convey the action of concentrating on specific variations.
• track: The verb 'track' implies following rather than focusing, which does not fit the intended meaning.

Correct answer: pick

Explanation: The verb 'pick' fits grammatically as it describes the action of populations adopting new expressions. It aligns with the context of selecting or acquiring language elements over time.

Meaning: 'Pick' means to choose or adopt something, in this case, new expressions in language.

Wrong options:

• assign: The verb 'assign' does not fit as it implies allocating rather than adopting expressions.
• light: The word 'light' is a noun and does not fit grammatically as a verb in this context.
• gather: The verb 'gather' means to collect, which does not convey the specific action of adopting expressions.
• mass: The noun 'mass' does not fit as it does not relate to the action of adopting language.
• zero: The verb 'zero' means to focus, which does not convey the action of adopting expressions.
• track: The verb 'track' implies following rather than adopting, which does not fit the intended meaning.

Correct answer: light

Explanation: The noun 'light' fits grammatically as it serves as the object of the verb 'sheds.' It aligns with the context of illuminating or revealing insights about cultural and social transformations.

Meaning: 'Light' in this context refers to understanding or insight that is shed on a subject.

Wrong options:

• assign: The verb 'assign' does not fit as it does not relate to the action of shedding insight.
• gather: The verb 'gather' means to collect, which does not convey the intended meaning of shedding light on a topic.
• mass: The noun 'mass' does not fit as it does not relate to the action of revealing insights.
• zero: The verb 'zero' does not fit as it does not convey the action of illuminating or revealing.
• pick: The verb 'pick' does not fit as it does not relate to the action of shedding light on a subject.
• track: The verb 'track' does not fit as it implies following rather than illuminating insights.