I believe that nobody like a messy room. So, cleaning up our rooms is an important part of our daily life. Though it sounds easy to organize our stuff lying around our rooms, it's really hard to do it well. First, Making a decision on whether the thing is trash, need to give away, has some future uses or just belongs in other places are alwys diffcult. We always tend to put most of them in some big boxes for future uses, but they become trash later, because we never use them again. So, before we sort our waste,we should know what thing in our rooms are wastes. There is a popular joke online says that the most important thing that a old man must to do is to say goodbye to the things they actually don't need any more. They like to make a place for everthing which definitely needs to throw away. When we finally decide to throw away something, we need to know which are recyclable or hazardous, because there are usually four trash bins waiting for you under your apartment. We are supposed to throw different kinds of trash into correct bins.