Problem: How does the sentence end?

Jeffrey has to take insulin for their diabetes, but Joel doesn't have that problem. That's because 
Answer: Joel barely eats sugar.

Problem: How does the sentence end?

Kyle showed Steven how to wear removable partials in everyday life because 
Answer: Kyle worked as a dentist.

Problem: How does the sentence end?

The car hit Joel but not Randy because 
Answer: Joel was in the middle of the street.

Problem: How does the sentence end?

Katrina lost the city council election to Erin, because 
Answer:
Katrina had an inexperienced campaign manager.