Hi, I would like to work as a ground hostess or at the Duty free at zurich airport. Do you think it's possible without German?

Very very unlikely, part of your job involves interaction with people and a lot of peiple who fly through Zurujch have German as their first, language.

I would agree that this is not possible. A close friend, who is actually British but married to a Swiss, speaks fluent Schwiizertuutsch, French, a little Italian and of course English. She could only find a job working very antisocial shift hours at the Kiosk in Zürich airport.