Select the word that best completes the sentence:
allison throughout the summer, working as many hours as possible to save money for a car.
practiced
labored
ignored
danced

Labored, because it mean she worked hard. Practiced wouldn't work, because it means she was practicing something. Does the sentence give any evidence of her practicing something? She couldn't possibly "ignored" throughout the summer, because that sounds incorrect. Say it out load. And, dancing wouldn't work, unless she got paid for dancing, which wasn't in the sentence. So, it would be 
B) Labored.