- Title: Exercise Workbook Social Studies Grade 4, Volume 2 (Lower) - Publisher: Yotsuya Otsuka Thank you for viewing. The answer sheets have been detached. There is an "X" written in pencil on the back (advanced problems). I wrote this as a mark to tell my child "You don't need to do the advanced problems." In the end, it was not used, so it is unused, but please understand the above condition before purchasing.