Meaning: 'Impossible' means something that cannot be done or imagined.

Wrong options:

• near: 'Near' suggests proximity, which contradicts the context of discussing a vast distance.
• travelling: 'Travelling' is a verb that does not fit the structure of the sentence, which requires an adjective to describe the distance.
• holding: 'Holding' is a verb that does not relate to the concept of distance and does not fit grammatically.
• powerful: 'Powerful' is an adjective that describes strength or intensity, which does not apply to the concept of distance.
• ceased: 'Ceased' is a verb that indicates stopping, which does not relate to the context of imagining distance.
• during: 'During' is a preposition that indicates a time period, which does not fit the grammatical structure of the sentence.
• seeing: 'Seeing' is a verb that does not fit the context of describing the nature of distance.

Correct answer: travelling

Explanation: The word 'travelling' is a gerund that describes the action of light moving. It fits grammatically and contextually as it explains how light behaves over the distance mentioned.

Meaning: 'Travelling' refers to the act of moving from one place to another.

Wrong options:

• near: 'Near' is an adjective that does not describe the action of light and does not fit grammatically.
• holding: 'Holding' is a verb that does not relate to the movement of light and does not fit in this context.
• powerful: 'Powerful' is an adjective that describes strength, which does not apply to the action of light.
• ceased: 'Ceased' is a verb that indicates stopping, which contradicts the ongoing action of light moving.
• during: 'During' is a preposition that does not fit the grammatical structure needed for this sentence.
• seeing: 'Seeing' is a verb that does not relate to the action of light and does not fit grammatically.
• impossible: 'Impossible' is an adjective that does not describe the action of light and does not fit in this context.

Correct answer: seeing

Explanation: The word 'seeing' is a gerund that describes the action of perceiving the star. It fits grammatically and contextually as it explains what happens when we look at the star.

Meaning: 'Seeing' refers to the act of perceiving with the eyes.

Wrong options:

• near: 'Near' is an adjective that does not describe the action of perceiving and does not fit grammatically.
• holding: 'Holding' is a verb that does not relate to the act of looking at a star and does not fit in this context.
• powerful: 'Powerful' is an adjective that describes strength, which does not apply to the action of seeing.
• ceased: 'Ceased' is a verb that indicates stopping, which contradicts the ongoing action of perceiving the star.
• during: 'During' is a preposition that does not fit the grammatical structure needed for this sentence.
• travelling: 'Travelling' is a verb that describes movement, which does not fit the context of perceiving.
• impossible: 'Impossible' is an adjective that does not describe the action of seeing and does not fit in this context.

Correct answer: powerful

Explanation: The word 'powerful' is an adjective that describes the strength of the telescopes. It fits grammatically and contextually as it indicates the capability of the telescopes to see distant stars.

Meaning: 'Powerful' means having great strength or capability.

Wrong options:

• near: 'Near' is an adjective that does not describe the telescopes and does not fit grammatically.
• travelling: 'Travelling' is a verb that does not relate to the description of telescopes and does not fit in this context.
• holding: 'Holding' is a verb that does not apply to the context of describing telescopes.
• ceased: 'Ceased' is a verb that indicates stopping, which does not relate to the capability of telescopes.
• during: 'During' is a preposition that does not fit the grammatical structure needed for this sentence.
• seeing: 'Seeing' is a verb that does not describe the telescopes and does not fit grammatically.
• impossible: 'Impossible' is an adjective that does not describe the telescopes and does not fit in this context.

Correct answer: ceased

Explanation: The word 'ceased' is a verb that indicates that something has stopped existing. It fits grammatically and contextually as it describes the fate of some stars.

Meaning: 'Ceased' means to have stopped or come to an end.

Wrong options:

• near: 'Near' is an adjective that does not relate to the concept of existence and does not fit grammatically.
• travelling: 'Travelling' is a verb that describes movement, which does not fit the context of stars that have stopped existing.
• holding: 'Holding' is a verb that does not apply to the context of existence.
• powerful: 'Powerful' is an adjective that describes strength, which does not relate to the fate of stars.
• during: 'During' is a preposition that does not fit the grammatical structure needed for this sentence.
• seeing: 'Seeing' is a verb that does not relate to the concept of existence and does not fit grammatically.
• impossible: 'Impossible' is an adjective that does not describe the fate of stars and does not fit in this context.