[1] our house was once a stop on the underground railroad. [2] it was common for enslaved people to stop there on his way to the north. [3] the underground railroad were a network of hiding places. [4] the cellar beneath our house has a secret door that was installed to trick slave catchers. [5] living in a piece of american history is pretty interesting. revise sentence 2 by adding the correct pronoun. it was common for enslaved people to stop there on way to the north.