1.Check your items before going to school.
2.Find his shortcomings and be a professor on that aspect in order to be as popular as him without a conflict.(也就是在他不擅长的方面成为专家,从而也变得受欢迎,同时又不会和他发生冲突,有利于保持友情）
3.Go to the Lost&Found or buy another ones.
4.Look for it where you think you might lose it.
5.Approach to your class headmaster.
6.Tell them your feelings and help them solve their problems.