Problem: How does the sentence end?

Kayla became upset when Sarah did not quickly respond to the message, because
Answer: Sarah was neglectful.

Problem: How does the sentence end?

After Craig solved the difficult math problem, he showed Justin the solution.
Answer: Craig was proud of himself.

Problem: How does the sentence end?

Joel threw a great costume party that Hunter won the best costume for, so
Answer: Joel gave the prize at the end of the night.

Problem: How does the sentence end?

Justin attended all of the wild parties without Brett, because
Answer:
Justin wanted to be a social butterfly.