Problem: How does the sentence end?

The schedule of Elena is much more packed than Christine's. 
Answer: Elena is a very busy person.

Problem: How does the sentence end?

The characters in Aaron's novel were more unique than Kyle's because 
Answer: Aaron is the more creative person.

Problem: How does the sentence end?

Nick gave Matthew a dose of medication because he had a fever. 
Answer: Nick checked on him later.

Problem: How does the sentence end?

Samantha was able to successfully breed and sell several pairs of lovebirds but Sarah could not, because 
Answer:
Samantha was good at handling animals.