[Q]: How does the sentence end?

Matthew takes his pet rabbit in to see Brett when it gets sick. This is because 

[A]: Brett is a concerned pet vet.


[Q]: How does the sentence end?

The boy slept worse on the bunkbed than the futon, because the 

[A]: futon was comfortable.


[Q]: How does the sentence end?

Eric's Facebook account has more friends than the one Ian has due to 

[A]:
Eric being a friendlier person.