Problem: How does the sentence end?

Rowan took pigs from the farm's field into the barn until the
Answer: field was empty.

Problem: How does the sentence end?

Rebecca has several pets but Rachel has none as
Answer: Rachel is a huge animal hater.

Problem: How does the sentence end?

I think I need to buy car insurance but not boat insurance because I take the
Answer: car out more.

Problem: How does the sentence end?

Justin was a natural optimist but not Neil.
Answer:
Justin found expressing gratitude came easily.