[Q]: How does the sentence end?

Samuel taught Matthew how to calm his overactive mind because

[A]: Samuel had successfully done so in the past.

[Q]: How does the sentence end?

The local business was not allowed into the international organization because the

[A]: business was unregulated.

[Q]: How does the sentence end?

Sarah took her sugar glider to Rachel, a veterinarian, but

[A]:
Rachel was not worried about the sugar glider even though it was getting old.