There's no doubt this is an excellent way to learn a language. Unfortunately, I'm deleting the app. I've filled the hearts twice today because the sentence to translate has been completely covered by the the multiple choice selections rendering the excercize useless. This happened twice today and it's a shame because my progress will be lost. I've submitted a bug report and, I appreciate how busy the developers are, however this doesn't help me today. Regrettably I'll have to uninstall.