[Q]: How does the sentence end?

I sat down at the desk and looked at the notepad and cell phone. I grabbed the 

[A]: cell phone since I really needed to text my friend.


[Q]: How does the sentence end?

Lawrence read fewer books on biology than Joseph, so 

[A]: Joseph was able to speak confidently about ecology.


[Q]: How does the sentence end?

Jeffrey quickly jumped to the rescue of Derrick after 

[A]:
Jeffrey saw them falling onto the subway tracks.