[Q]: How does the sentence end?

The author wrote notes on the writing pad with a pen until the 

[A]: pen was empty.


[Q]: How does the sentence end?

Elena did everything to not stress Rachel out over the weekend because 

[A]: Elena was very considerate.


[Q]: How does the sentence end?

Lindsey never suffered from a concussion after fighting but Maria did because 

[A]:
Maria never used a helmet.