[Q]: How does the sentence end?

Christine was happy to walk ten miles a day but Lindsey was not because 

[A]: Christine was very fit.


[Q]: How does the sentence end?

Carrie needs to hire someone to take Emily place at the fabric store, 

[A]: Carrie has been the manager at the fabric store.


[Q]: How does the sentence end?

Changing negative behaviors was easy for Jessica but not Katrina because 

[A]:
Katrina didn't have a lot of self discipline.