Yesterday, the students ___ (clean) the park and ___ (collect) the trash., Cleaned, collected, Cleaning, collecting, cleans, collects, Last week, my friends and I ___ (find) a lot of plastic bottles on the beach., Finded, Found, finding, The river ___ very dirty last month because people threw garbage into it., Is, Were, Was, The volunteers ___ (take) the trash to the recycling center yesterday., Took, Taked, Takes, There ___ many plastic bags in the park before we cleaned it., Was, Were, Are

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