Problem: How does the sentence end?

Nick is bad at writing letters, but William is great at them. This is due to 
Answer: William preferring English class.

Problem: How does the sentence end?

Christine loved to burn candles but Victoria hated it. 
Answer: Victoria suffered badly from scent sensitivity.

Problem: How does the sentence end?

James cannot prune the apex branch with that ax because the 
Answer: ax is too short.

Problem: How does the sentence end?

Peggy filled the bathtub with hot water and bubbles but not salts, because the 
Answer:
bubbles smelled good.