OK -- I thought I would get past the question, having memorized that "Cxu vi malpravas" in another exercise had to be rendered as "Cxu li malpravas" in order to be accepted as the answer. To my humble ears, this is still "Cxu vi malpravas", but this time must be rendered as "Cxu mi malpravas" in order to get past the question. So it's going to be even odds whether I can get past this level, guessing which answer I'm supposed to supply, when in each case I hear the same thing, "Cxu vi malpravas." Sigh.
It's not clear what that word is. Is it mi, vi, li, or ni? Any one of them will produce a correct sentence so context is not a clue. I get more answers wrong from muddled audio than anything else. If I say "can't listen now" I do very well, but when I try to listen I miss half of them.