I didn't know who/which to ask about my timetable. The people which/whose luggage was lost had to wait a long time

I didn't know who/which to ask about my timetable.
The people which/whose luggage was lost had to wait a long time.
Where the ruler whose/that I left on this desk
The shop what/that I went to didn't have any milk.
Do you know whom/whose bag is this?
Everyone who/which was there will remember the day forever.
The second bus, which/whose was full, didn't stop either.
Jim was helped by someone who/whom told him the answer.
​