Put in a suitable preposition (in, on, at). Mary wants to live and work ..... New York. My mother is working .... the farm

Put in a suitable preposition ( in, on, at )
Mary wants to live and work.....New York
My mother is working....the farm
I am standing......the crossroad.I don't know whether to turn left, turn right or go straight
......University, he was an excellent studen
My grandparent live...465 Mountain Street,....Viet Nam
There is a funny cartoon......TV now