Is there any way to temporarily disable listening questions? Because I activated listening questions, but when I'm in public and don't have my headphones with me, I can't skip these questions and I'm stuck.
No. This would be a nice feature to have, but it doesn’t exist now. As a workaround, you can clone your schedule and disable the listening vector in one copy.
Another workaround that I’ve resorted to on occasion is to answer I don’t know to listening questions, then mark as correct on the next screen. This is obviously less than ideal, but it works in a pinch, when I just want to finish the current quiz without messing with any settings.