1) It is very important ____ we all do something to make our environment healthier. 2) Here are some tips ____ helping the planet. 3) ____ you turn off your computer at night, you will save energy. 4) ____ paper cups and paper plates. 5) ____ before you print something. Do you really need to print it or is it enough to have it on your computer? 6) When you need to print out a lot of pages, ____ on both sides.

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