New words on "Listen and Type" exercises
I'm not sure if this issue was already discussed, but at least twice I had new words on "Listen and Type" exercises.
Since we have never seen the word before, it makes almost impossible to correctly answer the question (we can sometimes guess the spelling based on the sound).
Well, Janio, I always have a dictionary on my desk when I'm studying. Duolingo only learn a few words for us; it just help us to exercise and memorize. It works!