Problem: Continue the following story.

Tanya helped Mary cook dinner, because 
Here's how I want to continue it: Mary has been a terrible cook for while now.

Problem: Continue the following story.

Joy the dabbing YouTuber would sell her audience swag instead of merch because the 
Here's how I want to continue it: merch was overpriced.

Problem: Continue the following story.

Julie emptied the water bottle into the cup on her desk until the 
Here's how I want to continue it:
cup was full.