Timed Practice Pause
The way timed practice is working now isn't very useful. If you get an answer wrong, you don't have time to review your mistake and learn from it. Even if you get an answer right but the spelling was corrected you don't have time to look at the correction since the timer keeps running. Once you pick an answer, right or wrong, the timer should pause to allow you to review.
You can always go to the Vocabulary section and redo the particular word. Eventually the sentence will appear again and while you wait for the word you'll be reinforcing your understanding of the word. So it's basically a win-win situation. ^__^