Problem: How does the sentence end?

Erin combined their efforts with Amy's parents to help them, but
Answer: Amy refused to stop doing drugs.

Problem: How does the sentence end?

the nail chipped when it hit the rock as he was running in the morning because the
Answer: nail was delicate.

Problem: How does the sentence end?

He sold his collection of cards to the dealer, but kept the figures, because the
Answer: cards had monetary value.

Problem: How does the sentence end?

Kim threw out the dairy from the refrigerator and kept the meat since the
Answer:
meat was fresh.