Meaning: 'Without' means 'not having' or 'in the absence of,' indicating that people, animals, and plants cannot live if fresh water is not available.

Wrong options:

• Beside: 'Beside' indicates proximity and does not convey the necessary meaning of absence, making it contextually irrelevant here.
• Outside: 'Outside' suggests being external or not within a certain area, which does not fit the context of needing water for survival.
• Under: 'Under' implies a position below something, which does not relate to the necessity of water for life.

Correct answer: fit

Explanation: The word 'fit' appropriately describes a state of being healthy and in good condition, aligning well with the context of needing fresh water for health.

Meaning: 'Fit' means being in good health or physical condition, which is essential for humans who require fresh water.

Wrong options:

• good: 'Good' is a general term that does not specifically relate to health in the same way 'fit' does, making it less precise in this context.
• well: While 'well' can refer to health, it is typically used as an adverb rather than an adjective describing a state of being, which makes it less suitable here.
• happy: 'Happy' refers to a state of emotional well-being, which is not directly related to the physical necessity of water.

Correct answer: deep

Explanation: The word 'deep' accurately describes the significant distance below the Earth's surface where fresh water may be found, fitting both grammatically and contextually in the sentence.

Meaning: 'Deep' refers to a considerable distance from the surface, indicating that the water is located far beneath the ground.

Wrong options:

• much: 'Much' is a quantifier that does not describe depth and is therefore irrelevant in this context.
• long: 'Long' refers to distance in terms of length rather than depth, making it unsuitable for describing how far below the surface the water is.
• dirty: 'Dirty' describes the quality of water rather than its location, which does not fit the context of discussing depth.

Correct answer: can

Explanation: The word 'can' indicates ability or possibility, which fits grammatically and contextually in the sentence, suggesting that we have the capability to use the available fresh water.

Meaning: 'Can' means to be able to do something, indicating that we have the ability to utilize the fresh water available to us.

Wrong options:

• might: 'Might' implies uncertainty or possibility, which does not convey the same level of ability as 'can' does in this context.
• may: 'May' also suggests possibility but lacks the definitive sense of ability that 'can' provides, making it less appropriate here.
• will: 'Will' indicates future intention rather than present ability, which does not fit the context of discussing current usage of water.