I often can't find such things! Generally speaking, it will be in the classroom. Sometimes I take it to another place in the classroom. I just put it somewhere, and then I think it's lost, but some students will bring it to me after school ~ even if it's lost, don't worry too much. Now everything in the textbook is really lost. I can solve it by buying a good one, but I don't usually lose it. I don't know what you want ~ thank you ~