Generally speaking, junior students need to go out for internship, and you will have time to come back for internship, because you need to be busy with graduation thesis or graduation design and come back for a few days. It takes time to prepare these things, even your files. At this time, you need to live in a dormitory. If you don't keep the dormitory, there will be no place to live, so you need to keep the dormitory in your junior year.