What are the cats running on?
a wheel
These chopsticks are not very ___.
useful
He ___.
failed
The cat has an ___.
idea
He is ___ something.
inventing
What is the ___?
solution
What's this?
an invention
She is using her___.
imagination
This dog has a ___.
problem
What is this?
creativity
What's this?
a battery
The cat is ___ to climb on the bed.
trying
He ___.
succeeded.
What is this?
electricity