Skipped a class

I waked up 8:00 a.m. Then I prepared for school. When I locked key, I realized that I did not have my house's key. I thought I gave a key to my sister. I was at a loss then. I called my mother but she could not go home soon. So I could not go school. I thought I will not be in time for 2th class. I decided that I do not go school today.