[Q]: How does the sentence end?

Cynthia stayed the night at Amy's house because

[A]: Cynthia wanted to help her recover after the surgery.

[Q]: How does the sentence end?

Elena tried to warn Tanya that she was gluten intolerant based on her energy levels after eating since

[A]: Tanya was not paying attention.

[Q]: How does the sentence end?

Last month Elena went on vacation but not Christine because

[A]:
Elena had to take time off.