Problem: Continue the following story.

Jimmy was worried he would fail the class because his assignment was incomplete. The 
Here's how I want to continue it: assignment was due Monday.

Problem: Continue the following story.

The machine was easy to use for Donald unlike Nelson, because 
Here's how I want to continue it: Donald has used it in the past.

Problem: Continue the following story.

Erin failed to prevent Felicia from scoring a goal on her, although 
Here's how I want to continue it:
Felicia was usually slower than her.