How to make up the book?
Apply some ordinary glue to the spine of the book, or use double-sided tape. As for the cracks in the book block, you can't fix them. This happened to me, too. You don't have to worry. Generally, the book itself is not well bound, so it is not bound with thread, but with glue. It's okay. Libraries generally do not allow compensation. I didn't pay this money when I borrowed books from the university.