500
Proofread the following sentence and decide that the sentence is correct or revise the sentence.
When the snake bit the old man, anybody in the crowd who reacted by running toward the exit with their belongings in tow was soon sorry because another snake bit them at the door.
The correct sentence should read, "When the snake bit the old man, anybody in the crowd who reacted by running toward the exit with HIS OR HER belongings in tow was soon sorry because another snake bit HIM OR HER at the door.