[Q]: How does the sentence end?

The debt of Elena is out of control, but Lindsey barely has any. This is due to

[A]: Lindsey being a careful spender.

[Q]: How does the sentence end?

During detention Erin watched over everyone while Monica sat quietly during his punishment.

[A]: Erin is a teacher.

[Q]: How does the sentence end?

While teaching class, Natalie took Felicia's question on the planet Venus as

[A]:
Felicia liked learning.