Problem: How does the sentence end?

Brian rested on the large bed as Kevin studied because 
Answer: Brian was very tired from work.

Problem: How does the sentence end?

Mary got stranded along the side of the road, and Christine helped them, so 
Answer: Mary was thankful.

Problem: How does the sentence end?

The sight of blood made Erin faint, but not Samantha, which is why 
Answer: Samantha would be good as a nurse.

Problem: How does the sentence end?

Amy chose to eat the rock candy while Jennifer chose the potato chips because 
Answer:
Amy likes sweet snacks.