Problem: Continue the following story.

Emily adopted a miniature schnauzer without telling her roommate who disliked dogs, Carrie. 
Here's how I want to continue it: Carrie was upset when she brought the dog home.

Problem: Continue the following story.

Monica had small muscles compared to Rachel when it came to weight lifting so 
Here's how I want to continue it: Monica lifted lighter weights.

Problem: Continue the following story.

In order to gain control over the situation the leader shot his handgun up in the air but not his shotgun because the 
Here's how I want to continue it:
shotgun was malfunctioning.