Meaning: 'Are affected' means that the water levels are influenced or changed by something, in this case, climate change.

Wrong options:

• be increased: 'Be increased' is in the passive form but does not fit grammatically as it suggests an action that is not relevant to the subject of water levels.
• responsible: 'Responsible' is an adjective that does not fit grammatically as it cannot serve as a verb in this context.
• is used: 'Is used' is also in the passive voice but refers to the usage of farmland, not water levels, making it contextually incorrect.
• get changed: 'Get changed' is a colloquial expression that does not fit the formal tone of the text and is not grammatically correct in this context.
• is also needed: 'Is also needed' implies necessity but does not relate to the impact on water levels, making it contextually inappropriate.
• is created: 'Is created' suggests an active formation, which does not apply to the passive state of water levels being affected.

Correct answer: is used

Explanation: The phrase 'is used' is in the present passive voice, indicating that the farmland is currently being utilized for a specific purpose, which is to grow crops for animals. This fits grammatically and contextually within the sentence discussing agricultural practices.

Meaning: 'Is used' means that the farmland is currently employed for growing crops.

Wrong options:

• be increased: 'Be increased' is in the passive form but does not relate to the usage of farmland, making it contextually incorrect.
• responsible: 'Responsible' is an adjective and does not fit grammatically as it cannot serve as a verb in this context.
• are affected: 'Are affected' is in the passive voice but refers to water levels, not farmland, making it contextually inappropriate.
• get changed: 'Get changed' is informal and does not fit the context of discussing farmland usage.
• is also needed: 'Is also needed' implies necessity but does not relate to the usage of farmland, making it contextually inappropriate.
• is created: 'Is created' suggests an active formation, which does not apply to the passive state of farmland being used.

Correct answer: be increased

Explanation: The phrase 'be increased' is in the passive voice, indicating that international trade could be subject to enhancement. This fits grammatically and contextually as it suggests a potential action that could help address water shortages.

Meaning: 'Be increased' means that the level of international trade could be raised or made greater.

Wrong options:

• is going to rise: 'Is going to rise' indicates a future action but does not fit the context of trade, which is not about rising but about increasing.
• responsible: 'Responsible' is an adjective that does not fit grammatically as it cannot serve as a verb in this context.
• is used: 'Is used' refers to the usage of farmland, not trade, making it contextually incorrect.
• get changed: 'Get changed' is informal and does not fit the context of discussing trade.
• is also needed: 'Is also needed' implies necessity but does not relate to the action of increasing trade, making it contextually inappropriate.
• are affected: 'Are affected' refers to water levels and does not apply to the context of trade.

Correct answer: is also needed

Explanation: The phrase 'is also needed' indicates that water is required in addition to other factors mentioned. This fits grammatically and contextually as it emphasizes the necessity of water for energy demands.

Meaning: 'Is also needed' means that water is required for additional purposes, specifically for energy generation.

Wrong options:

• be increased: 'Be increased' does not fit as it suggests an action that does not relate to the necessity of water.
• responsible: 'Responsible' is an adjective that does not fit grammatically as it cannot serve as a verb in this context.
• is used: 'Is used' refers to the usage of farmland, not the necessity of water, making it contextually incorrect.
• get changed: 'Get changed' is informal and does not fit the context of discussing the necessity of water.
• are affected: 'Are affected' refers to water levels and does not apply to the context of necessity.
• is created: 'Is created' suggests an active formation, which does not apply to the necessity of water.

Correct answer: is going to rise

Explanation: The phrase 'is going to rise' indicates a future increase in demand, which fits grammatically and contextually as it discusses the anticipated growth in energy demand over the next 30 years.

Meaning: 'Is going to rise' means that an increase is expected in the future.

Wrong options:

• be increased: 'Be increased' does not fit as it suggests an action that does not relate to the future demand for energy.
• responsible: 'Responsible' is an adjective that does not fit grammatically as it cannot serve as a verb in this context.
• is used: 'Is used' refers to the usage of farmland, not energy demand, making it contextually incorrect.
• get changed: 'Get changed' is informal and does not fit the context of discussing future demand.
• are affected: 'Are affected' refers to water levels and does not apply to the context of future energy demand.
• is also needed: 'Is also needed' implies necessity but does not relate to the future increase in demand.