To live in this world, everyone must do his own duties. The duties for politics are researching the international and national affiars.Famers' duties are plant food . workers' duties are making all kinds of useful materials.Teachers' duties are teach knowledge to student s. Students' duties are study.If on one obey his own duties, this world will be in a mess,so every one must do his own duties,
一篇每句都有duty的英语演讲稿