Very Good App – English Grammar in Use: Sample Review

I suggest to change one think - to make an option to bookmark (save) certain part of the lesson (12a, 13в, 27с) and not the entire lesson (12a,12b,12c,12d). Sometimes, you need to save just part, nit entire lesson. Overall the app is very good. Thank you.
Review by DmRog on English Grammar in Use: Sample.