Holdingdoorsopen,pickinguprubbish,thankingpeople…thesea...
问题详情：Holdingdoorsopen,pickinguprubbish,thankingpeople…theseactsofkindnessseemverysmall.ButstudentsatTibbettsMiddleSchoolknowthatit’sthesmallactsthatmaketheworldabetterplace.Eighth-gradersfromNewM...