Problem: How does the sentence end?

Since Tom heard a noise when he applied the brake, he decided to fix the caliper rather than the rotor, because the 
Answer: rotor was silent.

Problem: How does the sentence end?

Joan decided to swap the old gemstone in her ring for a new gemstone because the 
Answer: old gemstone was uglier.

Problem: How does the sentence end?

Leslie carried an oxygen tank while working and Hunter did not because 
Answer: Leslie was a paramedic.

Problem: How does the sentence end?

Being called for jury duty bothered Joel but not Leslie, as 
Answer:
Joel felt it was a waste of their time.