He is the leader of the school. He is the ____.
principal
We need to ____ ____ the house.
clean up
She is a ___.
librarian
To _____ is to throw trash on the ground.
litter
She's not rude, she's very _____.
polite
His job is a ____ ____.
crossing guard
She works at the swimming pool. She's the ____ ____.
life guard
The ____ ____ turns green and red.
traffic light