[Q]: How does the sentence end?

Mary understood how credit, debt and APR worked and Sue didn't, so the 
OPTIONS:
- debt of Sue became quite large.
- credit of Sue became quite large.

[A]: debt of Sue became quite large.
QUES: Continue writing.

Craig was always ahead with his studyies compared to Steven. That's why 

OPTIONS:
- Craig needed to study more.
- Steven needed to study more.
+++++++++
ANS: Steven needed to study more.
Problem: How does the sentence end?

Jason could smell the age of a good cheese, unlike Hunter because 
OPTIONS:
- Jason had very small nostrils.
- Hunter had very small nostrils.
Answer: Hunter had very small nostrils.
sentence: Playing goalkeeper better suitted Emily and not Erin because  OPTIONS:
- Emily could not read a players penalty run up.
- Erin could not read a players penalty run up.
complete: Erin could not read a players penalty run up.
Leslie needed advice from Hunter on how to run a business, since 
OPTIONS:
- Leslie had no experience.
- Hunter had no experience.
Leslie had no experience.
Problem: Continue the following story.

The janitor tried to clean the mirror with the spray but the 
OPTIONS:
- mirror was too dirty.
- spray was too dirty.
Here's how I want to continue it:
mirror was too dirty.