Problem: How does the sentence end?

Knowing that Brian was in an abusive relationship, Joel offered a place to stay, because
Answer: Joel was being concerned.

Problem: How does the sentence end?

He placed the handkerchiefs in his closet instead of his dresser because the
Answer: dresser was overflowing.

Problem: How does the sentence end?

Brett was smarter than Aaron on the computer because
Answer: Brett started using a laptop when he was very young.

Problem: How does the sentence end?

Because Rebecca took gymnastics while they were a kid while Betty only played baseball,
Answer:
Betty could throw a curveball.