[Q]: How does the sentence end?

Justin went to check on Christopher at their dorm, but no one was there. 

[A]: Christopher was not available.


[Q]: How does the sentence end?

Elena decided to attend a seminar on self esteem but Christine did not as 

[A]: Christine was very confident.


[Q]: How does the sentence end?

Betty was more experienced than Jessica at chess, but it was a surprise when 

[A]:
Jessica won.