3 . 阅读下列短文,根据短文内容填空,在未给提示词的空白处仅填写1个适当的单词,在给出提示词的空白处用括号内所给词的正确形式填空。
Buildings around the world will go dark for 60 minutes this evening in a voluntary event 1 (know) as Earth Hour. This grassroots effort started in 2007 in Sydney, Australia, and since then it 2 (grow) into a global movement 3 (raise) awareness of our energy consumption and the effects of climate change on our planet. Anyone can participate in this movement by switching 4 the lights at 8:30 PM local time. Last year close to 18,000 landmark buildings switched off their lights in 188 countries. Will you dim your lights tonight?