It seems like you might be looking for specific terms to fill in those blanks related to the movement of a frog. Based on common descriptions of frog movement in a lily pad scenario, here is a suggestion:
Blank 1: 2
Blank 2: forward
So the full sentence would read: "To eat the fly on the pad at number 2, the frog must hop 2 spaces to the forward."
If this isn't what you're looking for, please provide more context or clarify your question!