Problem: How does the sentence end?

The conversation was interesting for Kevin but bored Joel , since 
OPTIONS:
- Kevin was familiar with the subject.
- Joel was familiar with the subject.
Answer: Kevin was familiar with the subject.

Problem: How does the sentence end?

Ian was mostly a better cook than William, but 
OPTIONS:
- Ian made the worse dish today.
- William made the worse dish today.
Answer: Ian made the worse dish today.

Problem: How does the sentence end?

It is obvious Christopher has a bigger ego than Brian because 
OPTIONS:
- Christopher is always bragging about awards.
- Brian is always bragging about awards.
Answer: Christopher is always bragging about awards.

Problem: How does the sentence end?

My father tried to drive the trailer into the garage but he couldn't, because the 
OPTIONS:
- trailer was too short.
- garage was too short.
Answer:
garage was too short.