After nearly a month of online classes, the following are my current difficulties. The first is that I need to keep checking my mobile phone because I am worried that I cannot receive the teacher's notice in time. The second problem is that sometimes the Internet is slow when I take an exam online or log into a website. The third problem is that I think the efficiency of online classes is less than that of school classes.What I am worried about is that the new semester can’t well connect with the rest of the courses, can’t well grasp the knowledge points to cope with the exam, I am worried about the problem of the network fortunately can be solved, and the second is a long time online class I am worried about the vision will be reduced. These are my problems and some of my worries, but I'm sure they won't affect me too much.