We can study,make friends,read books,do some sports,do some cleaning,do morning exercise and so on.
HAVE TO:do homework,have exams,study,have classes,
take notes,hand in homework
in time,
CANNOT:smoking,fall in love,cheating in the exam ,
fighting,dringking ,skip classes,
throwing away rubbish
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希望采纳，你的支持我们的动力！