Problem: Continue the following story.

Oliver could easily move the box but not the piano because the 
OPTIONS:
- box was heavy.
- piano was heavy.
Here's how I want to continue it: piano was heavy.

Problem: Continue the following story.

Extra money is made by Robert when they babysit the kids of Joel. 
OPTIONS:
- Robert is the parent.
- Joel is the parent.
Here's how I want to continue it: Joel is the parent.

Problem: Continue the following story.

Monica decided to buy Sarah a new laptop since 
OPTIONS:
- Monica didn't have enough money to buy a new one.
- Sarah didn't have enough money to buy a new one.
Here's how I want to continue it:
Sarah didn't have enough money to buy a new one.