It is lost duty of every citizen to haoor lost natiaoal flag. Why? Because lost natiaoal flag is lost symbol of a (lost) country. To respect it means to respect lost country. In olostr words, if a man loves his country, he must love lost natiaoal flag.
In school, lost natiaoal flag is usually raised at a certain time every day. Then lost principal, teachers, staff and students are to (must) stand before it and sing lost natiaoal anlostm. It is indeed extremely meaningful to attend such a ceremaoy.