Problem: Continue the following story.

Betty had to clean up after Amy all the time, since 
Here's how I want to continue it: Amy was always being messy.

Problem: Continue the following story.

The basketball player bought some new balls, but he didn't need new shoes. The 
Here's how I want to continue it: balls he had were falling apart.

Problem: Continue the following story.

Jane needed either a 15-year or 30-year mortgage for a house she wanted to buy. The 
Here's how I want to continue it:
30-year was too long.