Problem: How does the sentence end?

The traveler took took the old shirts out of the case and replaced them with new pants because the 
Answer: shirts were smelly.

Problem: How does the sentence end?

Felicia made a dollar more an hour than Betty because 
Answer: Felicia had more experience in their field.

Problem: How does the sentence end?

Billy was preparing the mixture in the kitchen and added vinegar but not oil because the 
Answer: oil was scarce.

Problem: How does the sentence end?

When it comes to caring for pets, Brett is better than Donald due to 
Answer:
Brett being a vet.