[Q]: How does the sentence end?

Isn't it wiser to buy a reusable filter than a disposable filter? I think the 

[A]: reusable filter is cheaper in the long run.


[Q]: How does the sentence end?

Leslie studied to become an auto body repair technician but not Robert, because 

[A]: Leslie was enthusiastic about cars.


[Q]: How does the sentence end?

Natalie went to see a patient in the hospital but not Betty because 

[A]:
Betty was out of town.