Discuss three elements, argument, argument, argument. You can explain the meaning of silence in the form of total score, then what is the inevitable connection between class and silence, why class should be quiet, and lead to your argument. Next, you can give examples or discuss why the class should be quiet from both sides. Do you think silence is good, bad or neutral? Select the corresponding materials, and finally deal with them at the end, emphasizing the summary of your own views.