[Q]: How does the sentence end?

Natalie always ate more eggs than Christine because

[A]: Natalie lived a healthy lifestyle and needed a lot of protein.

[Q]: How does the sentence end?

My sister filled out her forms faster than I filled out my documents because the

[A]: documents were harder.

[Q]: How does the sentence end?

Donald was building his rat rod when Joseph asked if he could help.

[A]:
Donald was elated to have the help.