[Q]: How does the sentence end?

William was shy and had trouble with having a good conversation with Kevin, because 

[A]: William was timid.


[Q]: How does the sentence end?

Nick knew the answers in advance, while Benjamin did not, because 

[A]: Nick had studied their textbook.


[Q]: How does the sentence end?

Enzo used a restraining snare to move his pig instead of a collar, because the 

[A]:
collar is unavailable to him.