if we leave the tap on, we, ......................................................., wasting water, wastes water, waste water, If you ................. water at the top of Mount Everest, it starts to boil., heats, heating , heat, If we heat water, it .........................................., boils , boiled, boiling , If you recycle, you ............................... the environment., helps, help, helping, When you heat ice, it ........................., melting, melted, melts.

Zero conditional

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