Fill in the blanks with suitable preposition (in/ on/ at/ from ...)

I . Fill in the blanks with suitable preposition.(in/on/at/from ...)
11. They are waiting __________ front of the theater .
12. The lamp is next __________ the picture .
13. The picture is __________ the wall .
14. Can you see the cat ___________ the picture ?
15. the child is hiding ___________ a tree .