Meaning: 'Infinitely' means to an unlimited extent or without end.

Wrong options:

• time: The word 'time' is a noun that does not fit grammatically in this context, as it does not describe the availability of energy.
• eventually: 'Eventually' is an adverb that indicates a future time but does not describe the availability of energy in the present context.
• phenomenon: 'Phenomenon' is a noun that refers to an observable event, which does not fit the context of describing energy availability.
• intersects: 'Intersects' is a verb that does not relate to the availability of energy and does not fit grammatically here.
• ensure: 'Ensure' is a verb that means to make certain, which does not fit the context of describing energy availability.
• rate: 'Rate' is a noun that refers to a measure, which does not describe the availability of energy.
• particle: 'Particle' is a noun that refers to a small portion of matter, which does not fit the context of energy availability.

Correct answer: ensure

Explanation: The verb 'ensure' fits grammatically as it serves as the action that the subject (implied 'we') must take regarding the use of energy. Contextually, it aligns with the responsibility mentioned in the sentence to manage energy resources properly.

Meaning: 'Ensure' means to make certain that something will happen or be the case.

Wrong options:

• time: 'Time' is a noun that does not fit grammatically as it does not represent an action related to energy management.
• eventually: 'Eventually' is an adverb that indicates a future time but does not convey an action related to ensuring proper use.
• infinitely: 'Infinitely' is an adverb that does not fit as it does not represent an action and cannot be used in this context.
• phenomenon: 'Phenomenon' is a noun that does not fit as it does not represent an action related to energy management.
• intersects: 'Intersects' is a verb that does not relate to the context of ensuring proper use of energy.
• rate: 'Rate' is a noun that does not convey an action and is not appropriate in this context.
• particle: 'Particle' is a noun that does not fit as it does not represent an action.

Correct answer: eventually

Explanation: The adverb 'eventually' indicates that non-renewable energy will run out after a certain period. It fits grammatically as it modifies the verb 'run out' and aligns with the context of discussing the finite nature of non-renewable resources.

Meaning: 'Eventually' means at a later time or after a period of time.

Wrong options:

• time: 'Time' is a noun that does not fit grammatically as it does not modify the verb 'run out' appropriately.
• infinitely: 'Infinitely' is an adverb that suggests unlimited availability, which contradicts the context of non-renewable energy running out.
• phenomenon: 'Phenomenon' is a noun that does not fit the context of discussing the depletion of energy resources.
• intersects: 'Intersects' is a verb that does not relate to the context of energy running out and does not fit grammatically here.
• ensure: 'Ensure' is a verb that does not fit as it does not relate to the timing of energy depletion.
• rate: 'Rate' is a noun that does not modify the verb 'run out' and is not appropriate in this context.
• particle: 'Particle' is a noun that does not fit the context of discussing energy depletion.

Correct answer: rate

Explanation: The noun 'rate' fits grammatically as it refers to the speed or frequency at which non-renewable energy resources can be replenished. Contextually, it aligns with the discussion of sustainability and economic extraction.

Meaning: 'Rate' refers to a measure or quantity, often used to indicate how quickly something occurs.

Wrong options:

• time: 'Time' is a noun that does not fit grammatically as it does not describe the speed of energy renewal.
• eventually: 'Eventually' is an adverb that does not fit as it does not describe a measure or frequency.
• infinitely: 'Infinitely' is an adverb that suggests unlimited availability, which contradicts the context of discussing the rate of renewal.
• phenomenon: 'Phenomenon' is a noun that does not fit the context of discussing the speed of energy renewal.
• intersects: 'Intersects' is a verb that does not relate to the context of energy renewal and does not fit grammatically here.
• ensure: 'Ensure' is a verb that does not fit as it does not describe a measure of renewal.
• particle: 'Particle' is a noun that does not fit the context of discussing the rate of energy renewal.

Correct answer: time

Explanation: The noun 'time' fits grammatically as it refers to the duration over which non-renewable energy can be extracted sustainably. It aligns with the context of discussing the limitations of energy resources in relation to human activities.

Meaning: 'Time' refers to the ongoing progression of existence and events, often measured in seconds, minutes, hours, etc.

Wrong options:

• eventually: 'Eventually' is an adverb that does not fit grammatically as it does not refer to a duration or period.
• infinitely: 'Infinitely' is an adverb that suggests unlimited duration, which contradicts the context of discussing finite time-frames.
• phenomenon: 'Phenomenon' is a noun that does not fit the context of discussing time and does not relate to the duration of energy extraction.
• intersects: 'Intersects' is a verb that does not relate to the context of discussing time and does not fit grammatically here.
• ensure: 'Ensure' is a verb that does not fit as it does not refer to a duration or period.
• rate: 'Rate' is a noun that refers to a measure but does not indicate a time-frame for energy extraction.
• particle: 'Particle' is a noun that does not fit the context of discussing time and does not relate to the duration of energy extraction.