[Q]: How does the sentence end?

Sarah was tone deaf while Betty was a singer, so

[A]: Betty sounded great when singing karaoke.

[Q]: How does the sentence end?

The smoothie that we decided to make was banana rather than blueberry, and this was because the

[A]: blueberry was scarce.

[Q]: How does the sentence end?

Christine was working online on the computer that Mary dropped a bowling ball onto.

[A]:
Mary broke the computer.