Problem: How does the sentence end?

Sarah asked Patricia how to clean a nebulizer because 
Answer: Sarah had just been diagnosed as an asthmatic.

Problem: How does the sentence end?

The cattle knocked down the fence and didn't stop until they reached the tree line, because the 
Answer: tree line intimidated them.

Problem: How does the sentence end?

After trying to use their broken drill, Katrina finally went to Amy and 
Answer: Katrina asked if they could borrow a working tool.

Problem: How does the sentence end?

It was easy for Robert but not Derrick to sleep on the bench because 
Answer:
Derrick took up too much space.