점점 따뜻해진다, get worse, recycling cans and bottles, using a cup, get warmer, 점점 나빠진다, recycling cans and bottles, recycling paper, get worse, turning off the water, 계단 이용하기, recycling paper, using the stairs, using a cup, turning off the water, 물 잠그기, turning off the water, turning off the lights, using the stairs, save water, 컵 사용하기, using a cup, using the stairs, save energy, turning off the water, 캔과 병 재활용하기, recycling paper, get warmer, recycling cans and bottles, get worse, 불 끄기, turning off the lights, recycling cans and bottles, using the stairs, get worse, 종이 재활용하기, get worse, recycling paper, using the stairs, get warmer, 에너지를 절약하다, save water, save energy, get worse, using the stairs, 물을 절약하다, recycling cans and bottles, save water, save energy, turning off the water.

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