Scratch

Hi! I love scratch and i was wondering, could i do this on scratch?   

At school we're doing a project about chocolate. I'm trying to make an advert.
It's like this;

Chocolate bar on bench,
Cat tries to get it, it can't,
Dog tries to get it, it can't,
Fish tries to swim out of bowl to get it, it can't,
Boy comes along and picks it up.

Do you think i could do it? 
I know it's a lot of work but I make my own videos so i will be able to do it,
if it's possible that is! 

So.... what are your thoughts, please tell me fast, it's for Friday
Thank Yooooooooouuuuuuu!