The water from the mountain stream was * ____, without any contaminants or pollution. The factory was fined for releasing * ____ chemicals into the river, causing environmental damage. The * ____ of gold is measured in karats, with 24 karat gold being the most pure. To make the water safe for drinking, we need to * ____ it by filtering out any harmful substances. The process of * ____ removes impurities from the water, making it clean and drinkable

pure, impure

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