[Q]: How does the sentence end?

Carrie was asked by Monica for recommendations on a new mobile device since 

[A]: Carrie was an expert on mobile security.


[Q]: How does the sentence end?

Natalie did not go to a prestigious private school but Angela did because 

[A]: Natalie had parents who did not make a lot of money.


[Q]: How does the sentence end?

Cynthia asked Christine tips for dealing with osteoarthritis since they knew 

[A]:
Christine just went to see their doctor for the same problem.