Problem: How does the sentence end?

Dennis explained the comic book cover to Aaron as 
Answer: Dennis was familiar with the whole series.

Problem: How does the sentence end?

Emily bought a fruit tree to plant from Katrina because 
Answer: Emily had a bare orchard.

Problem: How does the sentence end?

I wrote drafts of my article on notepad while out and computer while at home. The 
Answer: computer crashed so at least I had a backup.

Problem: How does the sentence end?

No matter where they went in the world, everyone always knew Derrick but not Nelson because 
Answer:
Nelson was not a famous person.