"Is hij aan het werken?"
Translation:Is he working?
You posted it on another sentence so I'll include this also here: https://www.mediafire.com/view/9z9pqiaep9trr8l
We have no control over what words you are able to select in the app. The only thing we are able to do is make sure that (only) correct answers are available. I assume there is an algorithm that then selects a few other words at random along with the correct words.