[Q]: How does the sentence end?

Matthew asked Jeffrey how you tell if something is gold or just gold plated, because 

[A]: Matthew had no clue.


[Q]: How does the sentence end?

Paul wanted to cook the steak on the grill instead of the stovetop because the 

[A]: grill was hot.


[Q]: How does the sentence end?

We didn't get much sleep not because of the alarm but because of the siren since the 

[A]:
siren was loud.