Problem: How does the sentence end?

Ryan could not calculate the multiplication tables like Nelson because 
Answer: Nelson had a faster brain.

Problem: How does the sentence end?

The fingernails of Amy are worked on by Rebecca because 
Answer: Rebecca works at the nail salon.

Problem: How does the sentence end?

When I had a migraine, I took the pills instead of the capsules because the 
Answer: pills worked great.

Problem: How does the sentence end?

Derrick suggested that Eric join him on his new diet. 
Answer:
Eric agreed that he had gained weight lately and should do something about it.