[Q]: How does the sentence end?

She was running out of time to get the mess in her room cleaned because the 

[A]: mess was huge.


[Q]: How does the sentence end?

Samantha helped Rachel study for her high school exams because 

[A]: Rachel is a good student.


[Q]: How does the sentence end?

Matthew was busy composing a play with Christopher as the main hero because 

[A]:
Matthew owed him a favor.