Quickly fill-in a pre-made template on the days activities for the students who are absent. Keep it on your desktop for easy access. The bonus to doing the work is that you have a running record of your lesson plans. I use it with my 9th graders. I fill it out and put it in a folder with their name on it. It is their responsibility to pick it up and complete the work. No chasing the student around. No annoing questions like, "What did I miss?," "Do I have to do anything?" and so on. An effective method, not to mention much easier than the old method.