protect, We must ______ the environment to save nature., recycle, People should ______ plastic bottles and paper., cut down, Try to ______ on electricity at home., throw away, Don’t ______ old clothes — give them to others., clean up, We will ______ the park after the festival., run out, We will ______ of clean water soon if we are not careful., turn off, Please ______ the lights when you leave the room., use up, You can ______ all your energy if you don’t rest., put back, Please ______ the book back on the shelf., burn up, Fire can ______ a lot of heat and smoke., give off, Cars ______ harmful gases into the air., throw out, Don’t ______ rubbish in the street., reduce, We must ______ pollution in big cities., go green, Many people want to ______ and help the planet., reduce your carbon footprint, You should ______ to help the Earth every day..

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