Meaning: 'Drinking' refers to water that is safe for human consumption, emphasizing the importance of clean water supplies.

Wrong options:

• add: 'Add' is a verb that does not fit the context of describing a type of water supply, as it implies an action rather than a descriptor.
• land: 'Land' is a noun that does not relate to water supply and does not make sense in this context.
• sample: 'Sample' is a noun that refers to a small part of something intended for testing, which does not appropriately describe a water supply.

Correct answer: filter

Explanation: The verb 'filter' is appropriate here as it indicates the action the municipal water treatment plant must take to remove herbicides from the water. It fits grammatically and contextually, as filtering is a common process in water treatment.

Meaning: 'Filter' means to remove impurities or unwanted elements from a substance, in this case, to purify the water by eliminating herbicides.

Wrong options:

• commercial: 'Commercial' is an adjective that does not fit grammatically or contextually, as it does not describe an action related to water treatment.
• molecules: 'Molecules' is a noun that does not convey an action and does not fit the context of what the treatment plant must do.
• pollution: 'Pollution' is a noun that refers to contamination itself, not an action that can be performed by the treatment plant.

Correct answer: soil

Explanation: The noun 'soil' fits grammatically as it serves as the object of the verb 'bind.' Contextually, it makes sense because the sentence discusses how herbicides can interact with the environment, specifically with soil, which is relevant to agricultural practices.

Meaning: 'Soil' refers to the upper layer of earth where plants grow, highlighting its role in the absorption of chemicals.

Wrong options:

• crucial: 'Crucial' is an adjective that does not fit grammatically as it cannot serve as an object in this context.
• regulate: 'Regulate' is a verb that does not fit as it does not serve as an object and does not relate to the binding of herbicides.
• water: 'Water' is a noun that does not fit contextually, as it does not align with the idea of binding herbicides in the same way soil does.

Correct answer: pollution

Explanation: The noun 'pollution' fits grammatically as it serves as the object of the verb 'minimize.' Contextually, it is relevant because the sentence discusses the negative impact of herbicides on the environment, specifically referring to contamination caused by these chemicals.

Meaning: 'Pollution' refers to the presence of harmful substances in the environment, particularly in water, which is a concern in agricultural runoff.

Wrong options:

• medical: 'Medical' is an adjective that does not fit the context of environmental contamination and does not relate to herbicides.
• alter: 'Alter' is a verb that does not fit grammatically as it cannot serve as an object in this context.
• toxic: 'Toxic' is an adjective that describes harmful substances but does not fit as a noun to indicate what needs to be minimized.