The Recycle Bin allows you to restore resources (files, links, pages, etc.) and activities (Assignment, Quiz, Forum, etc.) you have deleted from your course homepage within the last fourteen days. If the activity contained student submissions those will be restored as well. Unfortunately at this time the Recycle Bin can only restore items that were completely deleted in their entirety from the course homepage. Student submissions to an activity or individual parts of a resource/activity (like the description of an Assignment) that are deleted cannot be restored.