Earth Day,     1    (mark) on 22 April, is an annual event aiming to raise public awareness about environmental protection. First celebrated     2     1970, the Day now includes events in more than 190 countries and regions(地区). No matter what you like to do, there is a way to get involved in various     3    (activity) on Earth Day. You can plant a tree, make a meal with locally grown vegetables, or save power—the possibilities are endless.