Question:
Megan is a sociologist, Jessica is not therefore 

Answer:
Continue the sentence -- Megan could better explain the meaning of various holidays.


Question:
Erin invited Laura on walks to improve circulation in their feet, since 

Answer:
Continue the sentence -- Erin already had good habits of exercising.


Question:
Steven but not Benjamin was a good speaker because 

Answer:
Continue the sentence -- Benjamin did not take any linguistic classes in school.


Question:
Tickets to the show were left for Samantha, but not for Amy because 

Answer:
Continue the sentence -- Samantha knows the show's host.