[Q]: How does the sentence end?

Jennifer wanted to write a nice sentence and went to Lindsey for help knowing 
OPTIONS:
- Jennifer was grammatical.
- Lindsey was grammatical.

[A]: Lindsey was grammatical.
QUES: Continue writing.

Benjamin ran the mile two times slower compared to Joel because 

OPTIONS:
- Benjamin was too old.
- Joel was too old.
+++++++++
ANS: Benjamin was too old.
Problem: How does the sentence end?

The Ukulele is being taught to Matthew by Justin in class. 
OPTIONS:
- Matthew must be the person learning.
- Justin must be the person learning.
Answer: Matthew must be the person learning.
sentence: The heavy weight was too much for Ryan , while Aaron lifted it with ease, since  OPTIONS:
- Ryan had trained properly.
- Aaron had trained properly.
complete: Aaron had trained properly.
Dennis studied hard to get into college but Kenneth didn't. 
OPTIONS:
- Dennis was accepted to an Ivy League school.
- Kenneth was accepted to an Ivy League school.
Dennis was accepted to an Ivy League school.
Problem: Continue the following story.

As the boss, Rachel asked Cynthia nicely to do more work so 
OPTIONS:
- Rachel could go home later.
- Cynthia could go home later.
Here's how I want to continue it:
Cynthia could go home later.