I got this right but I only had the right words to choose from. Would Duo accept, "makes really stupid choisies" too?
Probably not; "things" is really the correct translation for "choses."
Would this also mean he sometimes makes really stupid choices??
No. "choses" means "things," not "choices."
This should be but not accepted by Duo:
He sometimes does things really stupid.
'He sometimes does really silly things' not accepted. I think it should be. Comments?