Problem: How does the sentence end?

Brian but not Jeffrey came down with mono because 
Answer: Jeffrey would not kiss every girl he saw.

Problem: How does the sentence end?

Maintaining concentration with a lot going on is hard for Jason but not Logan, because 
Answer: Logan doesn't have ADD.

Problem: How does the sentence end?

After the trip, Tanya had a wicked case of Diarrhea, though Rebecca had none. 
Answer: Tanya has the weaker stomach.

Problem: How does the sentence end?

Jeffrey burned fewer calories than Christopher because 
Answer:
Jeffrey jumped rope for an hour less per day.