Problem: How does the sentence end?

Justin had a sun burn on their skin but not Lawrence because 
Answer: Lawrence shielded them self to the sun.

Problem: How does the sentence end?

Christopher loved cake, but William didn't, so 
Answer: Christopher took the extra piece of cake for himself.

Problem: How does the sentence end?

Jess chose to use wallpaper and not paint for the walls because the 
Answer: wallpaper was prettier.

Problem: How does the sentence end?

they had to stop at the highway and not in the tunnel because the 
Answer:
tunnel was dark.