Work in/on the economic department?
Thank you so much.
One more question:
Playing in/on the playground?
That's answered in your other thread. Please keep unrelated quesitons in their own threads to avoid confusion. Thanks.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
OK sorry.