Treesareourgoodfriends.Theycleantheairandbringusenoughoxygen.Theyhelpkeepthebalanceofnature.Thegreenleavesandthedifferentgesturesofthetreesaddbeautytoourcity.Withtrees,manybirdscometoourcity.Theymakeourlifevividandinteresting.Weshouldprotectthetrees.Don'thurtourfriends--trees.