Problem: Continue the following story.

The teacher preferred sitting in a chair rather than a stool because the 
Here's how I want to continue it: stool was uncomfortable.

Problem: Continue the following story.

Nelson has a problem with blood pressure so he goes to his doctor Nick for help, because 
Here's how I want to continue it: Nelson is worried.

Problem: Continue the following story.

Christopher had a hangover from the night of the party, while Donald was not, because 
Here's how I want to continue it:
Christopher was a lightweight drunk.