Leave a Review 刘老师系列
The book is well organized. But purchasing does not work
I downloaded the book. It is free to download. I try to purchase the right to use the book, but failed. I have purchased other grades' book by the same author/publisher. Only the 6th grade 1st semester book has this issue. I also want 3rd grade 1st semester book by the same author, but it is not available on App Store.Show less