周恩来：“像春蚕一样，将最后一根丝吐出来，贡献给国家和人民。” 邓小平： “我是中国人民的儿子，我深爱我的祖国和人民。” 朱镕基：“不管前面是地雷阵还是万 丈深渊，我都义无反顾，一往无前，鞠躬尽瘁，死而后已。”他们的言语说明（　）

①高度的社会责任感来自对祖国命运的深切关注                     ②奉献精神是社会责任感的集中表现

③认清自己所承担的历史责任，勇于承担历史赋予的责任     ④在平凡的岗位上奉献了自己的力量

(1)The letter was ____  to my headmaster by a postman yesterday.

(2)I couldn't help ____  when I read the funny story.

(3)Of all the boxes, the one under the table is the ____ .

(4)The little boy fell down from the tree and hurt ____ .

(5)I am proud of my son because he is the____  of the sports meet.