Problem: Continue the following story.

My friend showed me an activity that I liked better than the last exercise, because the 
OPTIONS:
- exercise was easy.
- activity was easy.
Here's how I want to continue it: activity was easy.

Problem: Continue the following story.

Ollie wrote out an agreement when he sold his car, but not when he sold his skateboard because the 
OPTIONS:
- skateboard was cheap.
- car was cheap.
Here's how I want to continue it: skateboard was cheap.

Problem: Continue the following story.

After almost drowning Dennis was saved by Joel performing CPR on him. 
OPTIONS:
- Dennis was very grateful.
- Joel was very grateful.
Here's how I want to continue it:
Dennis was very grateful.