Problem: How does the sentence end?

Cynthia asked Lindsey to instruct them how to use sign language, because
Answer: Cynthia needed help learning it.

Problem: How does the sentence end?

Patricia had much better hearing than Jessica had because
Answer: Patricia was a much younger person.

Problem: How does the sentence end?

Rebecca had a more difficult time during pregnancy than Natalie did, because
Answer: Rebecca had some previous health problems.

Problem: How does the sentence end?

During the concert the ukulele sounded worse than the guitar because the
Answer:
ukulele was out of tune.