Problem: How does the sentence end?

Since Matthew lived with their parents while Jeffrey lived alone, 
Answer: Jeffrey was never told what to do at home.

Problem: How does the sentence end?

Nathan tried to improve his credit by paying his loan on time and earning more at his job, but the 
Answer: job paid little.

Problem: How does the sentence end?

Megan had vodka and Christine did not have any, so 
Answer: Megan needed a designated driver for that night.

Problem: How does the sentence end?

Laura taught their skills to Jessica, because 
Answer:
Jessica wanted to learn about all their accumulated knowledge.