In the US I live on the first floor, but in the UK. The first floor is the floor.
The baby elephant is drinking water its trunk. A. for B. on C. with
Can I speak to Tom? Please hold . A. in B. on C. to
He is talking my father. A. in B. for C. to
My birthday is December. A. in B. on C. at
What do you do the weekends? A. in B. on C. at