Unit 2 I'll help to clean up the city parks.

重点知识园地重点单词1.cheer v.欢呼;喝彩cheer up(使)变得更高兴;振奋起来I wrote that song just to cheer myself up.我写那首歌只是为了给自己打气。拓展cheer n.欢呼声;喝彩声2.volunteer v.义务做;自愿做n.志愿者volunteer to do sth自愿做某事Jack volunteered to carry water.杰克自愿去运水。I need one volunteer.我需要一名志愿者。