Problem: How does the sentence end?

Kenneth ate leftovers, but Aaron ate out because 
Answer: Kenneth had less money on them for lunch.

Problem: How does the sentence end?

The man took the stairwell to the third floor instead of the elevator because the 
Answer: stairwell was clear.

Problem: How does the sentence end?

The local cafe was a much better place for making new friendships than the library was, as the 
Answer: library was hostile to social activity.

Problem: How does the sentence end?

Rachel taught Tanya how to brush a cat's fur because 
Answer:
Tanya had not owned any cats before.