Problem: How does the sentence end?

Samuel failed their final exams while Brian passed them, so 
OPTIONS:
- Samuel had no need to retake their classes in summer school.
- Brian had no need to retake their classes in summer school.
Answer: Brian had no need to retake their classes in summer school.

Problem: How does the sentence end?

It was easy for Felicia but not Laura to win the race because 
OPTIONS:
- Felicia ran very quickly.
- Laura ran very quickly.
Answer: Felicia ran very quickly.

Problem: How does the sentence end?

The teacher asked Ian but not Robert if they were going to organize their notebook because 
OPTIONS:
- Ian was disorganized.
- Robert was disorganized.
Answer: Ian was disorganized.

Problem: How does the sentence end?

Laura thrives on conflict while Christine avoids it, so 
OPTIONS:
- Laura usually backs down from a fight.
- Christine usually backs down from a fight.
Answer:
Christine usually backs down from a fight.