Problem: How does the sentence end?

The ring had a large gemstone, which amazed Victoria but not Cynthia, since 
Answer: Victoria had always been interested in geology.

Problem: How does the sentence end?

Sarah shot the sheriff but Patricia didn't shoot the sheriff, so 
Answer: Sarah wound up going to jail.

Problem: How does the sentence end?

Paul tripped in mud, got his straight pants dirty, and needed to put some clean leggings. He put on some skinny pants because the 
Answer: straight pants are dirty.

Problem: How does the sentence end?

Michael said goodbye to Christopher, his best friend who was going to California to star in a movie, and 
Answer:
Christopher was very excited.