[Q]: How does the sentence end?

JustinX hired Nelson to build his new fireplace, because 

[A]: Nelson is great a stone mason.


[Q]: How does the sentence end?

At the meet and greet event, Amy asked Lindsey to sign a copy of the book, since 

[A]: Lindsey was the author.


[Q]: How does the sentence end?

Emily needed to get a new bra so Kayla helped pick one out at the department store by 

[A]:
Kayla asking for bras in the dressing room.