Problem: How does the sentence end?

Samantha was trying to have a serious conversation, but Christine kept being goofy, so
Answer: Christine was unable to hear their point.

Problem: How does the sentence end?

Brett could ride a mountain bike while Hunter could not because
Answer: Hunter had weaker balance.

Problem: How does the sentence end?

The parents got their children masks as costumes for their children instead of robes because the
Answer: costumes were expensive.

Problem: How does the sentence end?

Brian is a member of the YMCA, but Benjamin is not, so
Answer:
Brian works out all the time.