2019北京卷
Earth Day, ___4___(mark) on 22 April, is an annual event aiming to raise public awareness about environmental protection. First celebrated ___5___ 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 ___6___(activity) on Earth Day. You can plant a tree, make a meal with locally grown vegetables, or save power—the possibilities are endless.
答案解析：
4. 根据原文“Earth Day, ___4___(mark) on 22 April, is an annual event aiming to raise public awareness about environmental protection.”可知，句子的谓语动词是“is”，“mark”与“Earth Day”之间是被动关系，即“地球日被定在4月22日”，因此，这里要用过去分词作后置定语来修饰“Earth Day”，“mark”的过去分词是“marked”，所以填“marked”。
5. 根据原文“First celebrated ___5___ 1970, the Day now includes events in more than 190 countries and regions(地区).”可知，“在某一年”要用介词“in”，“in 1970”表示“在1970年”，所以填“in”。
6. 根据原文“No matter what you like to do, there is a way to get involved in various ___6___(activity) on Earth Day.”可知，“various”表示“各种各样的”，后面要接可数名词的复数形式，“activity”的复数是“activities”，所以填“activities”。
