Problem: How does the sentence end?

The students used the cards instead of the books to improve their memory of the subject because the 
Answer: cards were more relevant.

Problem: How does the sentence end?

Erin thought the house was haunted but Natalie disagreed. 
Answer: Erin had long believed in ghosts and the paranormal.

Problem: How does the sentence end?

Samantha seems to always have a liquor bottle in their hand while Patricia didn't, so 
Answer: Patricia looked sober.

Problem: How does the sentence end?

Monica was able to afford a luxury vacation, but Laura stayed home, because 
Answer:
Monica earned a much smaller salary.