Problem: How does the sentence end?

My mom couldn't fit all of her medication in her purse, because the 
OPTIONS:
- medication was in large bottles.
- purse was in large bottles.
Answer: medication was in large bottles.
sentence: Adam wore the t-shirt to the meeting even though Dennis told them it was formal because  OPTIONS:
- Adam is compliant.
- Dennis is compliant.
complete: Dennis is compliant.
He knew that the sun was closer to earth than the other star, because the 
OPTIONS:
- sun was duller.
- star was duller.
star was duller.
Input: Continue writing.

It is hard to learn ventriloquism, but easy to learn puppetry, as the 
OPTIONS:
- ventriloquism is very simple.
- puppetry is very simple.

Continued: puppetry is very simple.
Story needs to be completed:
Brian got a job working with dogs, while Derrick worked in sales because 
OPTIONS:
- Brian was a people person.
- Derrick was a people person.

My choice:
Derrick was a people person.
Problem: How does the sentence end?

Isn't it wiser to buy a reusable filter than a disposable filter? I think the 
OPTIONS:
- reusable filter is expensive in the long run.
- disposable filter is expensive in the long run.
Answer:
disposable filter is expensive in the long run.