Problem: Continue the following story.

Kenneth was able to catch the train home on time but Eric was not because 
OPTIONS:
- Kenneth left work early.
- Eric left work early.
Here's how I want to continue it: Kenneth left work early.

Problem: Continue the following story.

Benjamin takes very good care of their skin but Brian does not. 
OPTIONS:
- Benjamin looks much younger than they really are.
- Brian looks much younger than they really are.
Here's how I want to continue it: Benjamin looks much younger than they really are.

Problem: Continue the following story.

The chemicals that I bought didn't clean the counters well because the 
OPTIONS:
- chemicals were too dirty.
- counters were too dirty.
Here's how I want to continue it:
counters were too dirty.