Thank you! I am very interested in this project and want to keep working on it, hopefully getting help from open source contributors. I actually had this idea

Thank you! I am very interested in this project and want to keep working on it, hopefully getting help from open source contributors. I actually had this idea of using Duolingo's style exercises, but now with your comment, I realize some might not be appropriate for individual learners with different goals. The cool thing would be to have customizable exercise types, where users can choose which ones they want and which ones they don't want! I will add this to the roadmap in the README, pointing out this comment! Thanks again!