[Q]: How does the sentence end?

Donald asked Christopher on how to heal a sprained ankle but

[A]: Christopher was clueless on the topic.

[Q]: How does the sentence end?

The robe was more expensive than the pajamas because the

[A]: robe was made of better materials.

[Q]: How does the sentence end?

Jeffrey was able to spend more time with family than Samuel because

[A]:
Samuel lived far away.