Problem: How does the sentence end?

The fish tank of Brett is dirtier than the one that Leslie owns, so 
Answer: Leslie is a proper pet owner.

Problem: How does the sentence end?

All of the sports balls wouldn't fit into the bags, because the 
Answer: balls were too many.

Problem: How does the sentence end?

Mom removed the baby's diaper and put the baby in a clean towel, because the 
Answer: towel was fresh.

Problem: How does the sentence end?

Cynthia did well in school while Monica did not because 
Answer:
Cynthia studied hard and respected her teachers.