[Q]: How does the sentence end?

Eric was teaching all of the proper stretches to Neil, because 

[A]: Eric was using them to get paid.


[Q]: How does the sentence end?

The costume Megan wore was a mystery to Rebecca , so 

[A]: Rebecca would not know her true identity.


[Q]: How does the sentence end?

Brian gave Matthew lemons to use in the pie recipe because 

[A]:
Matthew had recently asked for some.