Problem: Kevin was the victim of scams quite often but Joel never was, because

My choice: Joel was very astute.

Problem: Becoming a teacher didn't suit Robert as well as Eric because

My choice: Eric really likes children.

Problem: Mary has a good deal of energy but Carrie rarely does because

My choice: Carrie eats a very poor diet.

Problem: Felicia had pet dogs and Natalie has a cat, so

My choice:
Felicia gave their dog a bath.