1) if we leave the tap on, we, ....................................................... a) wasting water b) wastes water c) waste water 2) If you ................. water at the top of Mount Everest, it starts to boil. a) heats b) heating c) heat 3) If we heat water, it .......................................... a) boils b) boiled c) boiling  4) If you recycle, you ............................... the environment. a) helps b) help c) helping 5) When you heat ice, it ......................... a) melting b) melted c) melts

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