[Q]: How does the sentence end?

John regretted leaving his job working with tires to start working with engines, since the 

[A]: tires generated enormous cash flow.


[Q]: How does the sentence end?

The mechanic tried to cover the car with a tarp but it didn't fit because  the 

[A]: tarp was too short.


[Q]: How does the sentence end?

Kayla loved to go to the gym to exercise while Katrina preferred to be outside; 

[A]:
Katrina primarily ran on the trail.