[Q]: How does the sentence end?

Katrina had an electric guitar, and Carrie had an acoustic, so

[A]: Katrina needed an amp for their instrument.

[Q]: How does the sentence end?

Christopher waited in line at the passport office until they got to see Leslie at the booth, and

[A]: Christopher got his passport at last.

[Q]: How does the sentence end?

Michael was chosen to read to Donald because

[A]:
Donald needed a very loud reading voice.