Английский 10 класс ПOмогите Пж

Coose the correct preporsition:
1) Leave him alone; stop picking on/at him.
2) They can pick hom out/up on the way.
3) Laura is picking on/at her food; I guess she's not hungry.
4) Would you please pick up/on that book from off the floor?
5) I'll pick you out/up from the station at 9.