Answer:
Nine big dogs in military collars come into the barn and attack Snowball. They chase Snowball off of Animal Farm and he is never seen again.
Explanation:
The other animals are petrified. They realize that these nine dogs are the puppies that Napoleon took away from their mother to educate privately.
House is the antecedent of the pronoun "it"
Answer:
D: all the actors and actresses went to the after party
A seems the most logical in this sense, since parents are portrayed (and majority do) sacrifice a lot so their children can live good and better lives than they did.