Story needs to be completed:
Betty became a doctor while Maria did not despite the fact that

My choice:
Maria graduated medical school.

Story needs to be completed:
Leslie studied to become an auto body repair technician but not Robert, because

My choice:
Robert was not interested in cars.

Story needs to be completed:
Brian wrote a long message on the poster instead of Nick because

My choice:
Brian was much more creative.

Story needs to be completed:
Erin was a slow learner while Christine was a quick learner, so

My choice:
Christine skipped a grade.