Fill in the correct particle.

1. War broke out in 1992, and it lasted until 1995.
2. Children are always happy when school breaks up for the holidays.
3. The burglars broke into the house in the middle of the night and stole all the jewelry.
4. His serious face broke into a grin when he read the joke.
5. The bus broke down, so all the passengers had to get off and wait for another one to come.
6. The little girl broke down and cried when her dog died.
7. The dog broke out of the garden and chased the cat down the street.