If you ........ ice, it melts., heat, heats, If water ............ 100 degrees Celsius, it boils., reaches, reache, If you ........red and blue, you get purple., mixes, mix, If it .........., the ground gets wet., rain, rains, If you........ an object, it falls to the ground., drop, droped, If you ....... fire, you get burned., touches, touch

Zero conditional

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