[Q]: How does the sentence end?

It's obvious that Una's location in a technological city is present day and not from the past like a hunter gatherer village because the 

[A]: village is ancient.


[Q]: How does the sentence end?

Rachel had a lot more in common with John than Samantha did because 

[A]: Rachel went to school with him.


[Q]: How does the sentence end?

Walking the dog in the summer heat suited Maria and not Sarah because 

[A]:
Sarah hated to sweat.