I have tried to strengthen the skill "Numbers" three times now, and every time I get stuck on one question in speaking practice. The question asks me to say "Quatro, três, dois, um, zero." The only reason I keep getting stuck on this is because it won't accept my answer. It puts the number in numerical form instead of word form, saying that I'm saying it wrong. I don't know if this is a bug or not, but I'll just turn off speaking practice until this is fixed. Thank you for taking the time to read this post and have a nice day. ^_^