You should make good use of your time to make up missed lessons.
你应该充分利用时间来弥补缺失的功课。
As regard the lessons to be missed during my absence, I will do my best to make them up as soon as I get back from leave.
至于请假期间落下的课程，之后我会尽快补上。
We don't refund the fee and make up the missed lessons because of the students.
因学生自己原因不能来上课，不予补课，也不予退还相关费用。
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