Problem: How does the sentence end?

Monica hated giving speeches in school unlike Betty because
Answer: Betty was a lot more confident.

Problem: How does the sentence end?

Felicia pulled ahead of Rachel while swimming because
Answer: Rachel was swimming slower than everyone else.

Problem: How does the sentence end?

Kenneth decided to adopt a child while Adam refused because
Answer: Adam hated the idea of raising children.

Problem: How does the sentence end?

The products that Steven bought were more expensive than those of Leslie, since
Answer:
Steven was a wealthy person.