"Mi hermana siempre hace su tarea."
Translation:My sister always does her homework.
I answered "... does her chores.". Answer accepted but with typo they say " chore". I have never heard chore in ENglish, it is always chores.
It would have to be the singular to align with the sentence. I've used chore on its own plenty of times:
"That's her chore, not yours"
"Babysitting this dog is such a chore"