Based on the clues provided, here’s how you could fill in the blanks:

I usually live in a house or on a farm. I am 1) **smaller** (small) than a rabbit, but I'm 2) **bigger** (big) than a snail. I am 3) **slower** than a cat, but I'm 4) **clever** than a rabbit. I love cheese!

What am I?
I'm a **mouse**.

So the completed sentences would be:

I usually live in a house or on a farm. I am 1) smaller than a rabbit, but I'm 2) bigger than a snail. I am 3) slower than a cat, but I'm 4) clever than a rabbit. I love cheese!

What am I?
I'm a 5) **mouse**.