[Q]: How does the sentence end?

Natalie took much longer to wash their hair than Sarah although

[A]: Sarah had longer hair.

[Q]: How does the sentence end?

The crowd of people left the platform and boarded the train, and therefore the

[A]: train became crowded.

[Q]: How does the sentence end?

Randy studied hard in their first year of college and Nick did not, which meant that

[A]:
Nick got bad grades.