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4/Four.
The students’ photos and the teachers’ photos.
The “best dressed”.
Because they are graduating.
It's meaningful/necessary. (言之有理即可)
Most students are in favor. They think music brings happiness. It can also relax our brains.
And it can improve the study efficiency of the next class. However, some students are
against it. They say the break time is too short to achieve the expected effect. Sometimes 
students are still lost in the music when having classes, which affects their study.
I think playing music during the break is good because it can help us relax and improve 
study efficiency.
Best wishes!
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