Of course, there were differences in the behavior of students in individual classes and also in teaching. In one class, a student sang a song that was very long and difficult to remember. He added to the value of the song the student's speech and the purity of the tone. In another class, there were students who discussed the topic with me and participated in teaching, which of course I was happy about.
He added to the value of the song the student's speech and the purity of the tone.