Problem: How does the sentence end?

Logan was an inferior card player to Donald because 
Answer: Donald had a good poker face.

Problem: How does the sentence end?

Logan was more prone to illness than Donald because 
Answer: Donald had a strong immune system.

Problem: How does the sentence end?

Samantha has an affinity for salt while Katrina does not, so 
Answer: Samantha likes licking the top of the martini glasses.

Problem: How does the sentence end?

Cynthia didn't know anything about physics but Laura did because 
Answer:
Laura was smarter at science.