[Q]: How does the sentence end?

Eric had to listen to Christopher complain about their acne.

[A]: Christopher had acne because they took bad care of their skin.

[Q]: How does the sentence end?

Neil had a larger coin collection than Joseph because

[A]: Neil had been collecting for longer.

[Q]: How does the sentence end?

My dog started to have a stroke, and the medicine I used didn't help because the

[A]:
stroke was too severe, so I called the animal hospital.