Problem: Continue the following story.

Amy wanted a soft toothbrush but Mary wanted a firm one because 
Here's how I want to continue it: Mary was concerned about tarter.

Problem: Continue the following story.

Sarah (an adopted child) and Jessica (a foster child) lost their parents in unexpected car wrecks, and 
Here's how I want to continue it: Jessica lost their parents wealth since they were an foster child.

Problem: Continue the following story.

The essay on DNA structures was read more than the one on Proteins, so the one on 
Here's how I want to continue it:
Proteins must be more dull.