Don’t criticize him for keeping away from class. He was ill.

他病了，休怪他旷课。

While keeping away from too much clutter is good, adding a few items that mean something to you will make your desk more enjoyable to work at.

保持书桌远离杂乱是好的,而在你的书桌上增添一些装饰对你更有意义，这会让你更加愉快的工作。