8．
(1)锻炼v.& n. __________________
(2)习惯n.__________________
(3)胃.n_______________________
(4)牙医n.__________________
(5)传统的adj.___________________
(6)平衡，平衡状态n._________________
(7)大自然，自然界n._________________
(8)地铁n.__________________________
(9)公共交通n.___________________
(10)邀请，邀请书n._________________
(11)必要的adj.___________________
(12)消息，信息n.____________________
(13)乘客n._____________________
(14)纪念物n._____________________
(15)演出，表演v.___________________
(16)有创造力的adj.___________________
(17)严肃地adv.______________________
(18)经历；经验n.______________________
(19)特别，尤其adv.________________________
(20)杂志n.____________________