Problem: How does the sentence end?

Kayla belonged to an important group unlike Jennifer, since 
Answer: Kayla was a very popular person.

Problem: How does the sentence end?

Plucking the brow took longer for Elena compared to Katrina because 
Answer: Elena had a uni-brow.

Problem: How does the sentence end?

Dennis explained the comic book cover to Aaron as 
Answer: Aaron was unfamiliar with the whole series.

Problem: How does the sentence end?

Blue hair dye appealed to Samuel, but not Jason because 
Answer:
Samuel always loved the color blue.