更正在括号处注明!总共十处错误!
Last Sunday,our class organized some (volunteer) activities,in which all of us took (加入an) active part.We (加入were) divided into three groups.Group 1 went to the park,(where) they planted trees,watered flowers and cleaned (去掉the) grass-lands to make them more beautiful.Group 2 made their greatest (efforts) to give the bus station a thorough cleaning.(After) being cleaned,(去掉and) the station took on a new look.Group 3 (went) to the old people's home to present wonderful performances to make the (aged) there happier.What a meaningful day!