EarthDay， 4 （mark）on22April，isanannualeventaimingtorais...

問題詳情：

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（地區）. 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.

【回答】

4. marked       5. in          6. activities       

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