请根据下列提示,用英语写一篇日记..记述你3月16日（星期天的活动)

Today is sunday。Our teacher took usto the park as volunteers to take part in a activity。We went to the park at 8:00am and arrived at 9:00am。We did our work as soon as get there。Some students planted trees and some watered flowers。The others helped workers to clean the park。We tried our best to finish our work and our teacher speaked high of us。By the time of 11:00am,we finished our work。Although we were tired,we were very happy。很简单的一篇作文,主要是要注意文章中的时态 问题,以为是日记,应用过去时来写。