There is nothing in this statement to indicate whether they are just popping out or going permanently. So why is ils quittent bientot marked wrong?
It states in the lesson -
"quitter means to leave someplace / somewhere. You cannot use it on its own: it always needs an object, and it can be used for places and people (for example to break up).+
Hope this helps!
Quitter needs a direct object to specify what you're leaving. Furthermore, partir is the default word for "to leave" in a general sense. It works without a direct object. Quitter is leaving in a more final, irreversible sense.
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