Problem: How does the sentence end?

They coughed in the living room more than in the kitchen because the 
Answer: living room was much dirtier.

Problem: How does the sentence end?

Metal chopsticks tend to be shorter than wood ones. Jake preferred the 
Answer: metal ones for being compact.

Problem: How does the sentence end?

Joel was considered a prospect but not William because 
Answer: William was inept at the sport.

Problem: How does the sentence end?

Cynthia went through her dresser looking for a sweater; when she couldn't find one, Rebecca lent her one. 
Answer:
Rebecca was appreciated.