Show recap after (timed) practice
Another way to handle errors during timed practice (because the timer doesn't stop) is showing a recap after the practice. A list of all the sentences you had to write or select and show what you typed and what was the correct answer.
Just an idea, maybe something for the hackaton ;)
that would be nice, and then being able to click on them to see the discussion. I often want to read the discussion during the timed practice to understand more nuanced aspects of phrases etc. but the timer doesn't stop when you click on discussion, and then runs out and you lose the discussion page anyway