Question

Which sentence correctly uses the word "so"?
Dot and Jill volunteered to appear in the movie, so did Elliott and Antonio.
The city park and the ice-skating rink were used for scenes in the movie, so were the school and pizza parlor.
His friends were really impressed with the movie, so were his parents and the film teacher.
He had seen tons of movies that were really lame, so he decided to make his own.