[Q]: How does the sentence end?

Erin brought Mary wood for the campfire since

[A]: Erin had extra wood needed for cooking at the campsite.

[Q]: How does the sentence end?

Jessica asked Erin many questions about activites in Washington because

[A]: Erin used to live there.

[Q]: How does the sentence end?

Felicia was able to grow beautiful multi-colored lilies in the backyard without a problem, but Sarah struggled to get anything to grow, because

[A]:
Felicia had a greenthumb.