[Q]: How does the sentence end?

To cope with her problems the teenager wrote in the journal and not the diary since the

[A]: diary 's pages were smaller.

[Q]: How does the sentence end?

Joseph was very quick to heal when injured but Randy was not because

[A]: Randy was very unhealthy.

[Q]: How does the sentence end?

Sarah had a bachelor's degree in microbiology and Katrina had a PhD, so

[A]:
Katrina had an easy time finding a cure for the disease on the proficiency test.