I think it's 10. J. 11. C. 12. G.
1. Nor
2.neither
3.neither
4.nor
5.nor
6.neither
The chandelier dangled over the table, on which the girl stood dancing, but then she fell onto the floor.
The prepositional phrases are as follows;
OVER the table
ON which the girl stood dancing
ONTO the floor
I really hope I helped! : )