Problem: How does the sentence end?

Cynthia always dwelled on the past whereas Maria did not, so 
Answer: Cynthia frequently looked at old photographs in a photo album.

Problem: How does the sentence end?

The boss gave Laura the job instead of Samantha because 
Answer: Samantha disgusted the boss with bad manners.

Problem: How does the sentence end?

Michael grew corn on his farm and gave it all to Nick because 
Answer: Michael had no use for it.

Problem: How does the sentence end?

The graphic novel that Robert wrote sold fewer copies than Michael, so 
Answer:
Robert is the shoddier writer.