[Q]: How does the sentence end?

Donald has the most intelligent little dogs thought Dennis,

[A]: Donald is a dog owner and teaches them many things.

[Q]: How does the sentence end?

The structure that Adam was in was more unstable than that of Aaron's because

[A]: Aaron was in a modern building.

[Q]: How does the sentence end?

Lawrence could install the router on their own but not Christopher because

[A]:
Lawrence was proficient in electronics knowledge.