5、sebagswhichcanbereusedagainandagain. Finally,reusepaperandourtextbook.Inthatway,manytreeswillbesaved.Inoureverydaylife,wealsohavemuchwhichwecansave.Forexample,weoughttoturnofflightsthemomentweleavetosaveelectricpower,andturnoffthetapintimetosavewater. Ass