[Q]: How does the sentence end?

He decided do buy the wool jacket instead of the linen one, because the

[A]: wool jacket is better for the winter.

[Q]: How does the sentence end?

Matthew always struggled with communication, but Donald did not, because

[A]: Donald was extremely extroverted and outgoing.

[Q]: How does the sentence end?

Brett had many more friends than Kenneth had because

[A]:
Kenneth was meaner to other people.