[Q]: How does the sentence end?

Erin needs parental supervision to do the experiment, but not Maria because

[A]: Erin is a young child.

[Q]: How does the sentence end?

Austen and Sara were tired of clothes cluttering their home but kept the gifts because the

[A]: clothes were plentiful.

[Q]: How does the sentence end?

Ryan took an aspirin when they had a headache but Jason did not because

[A]:
Jason had a high pain threshold.