As the children go “further up and further in,” how do they cross the great waterfall?  

They didn’t stop and kept going on. They moved their legs and arms as if they were swimming in the waterfall. But actually they were climbing up the waterfall, up and up, higher and higher, until they arriving the top of the waterfall.

Who comes out to greet them when they reach the walled garden? 

a little, sleek, bright-eyed Talking Mouse with a red feather stuck in a circlet on its head and its left paw resting on a long sword. it’s the great hero of Narnia “Reepicheep”. It opened the door and welcome them to come in

Are they finished going “further up and further in”?  

 I  think they didn’t finished the “further up and further in”. They kept going in and in and found the was larger than seeing from the outside.    

What does Jill realize about the garden?  

I think it should be “what does Lucy realize about the garden”

Lucy compared the garden and the stable to know that the garden was the same as the stable. The inside was bigger than the outside, the garden was a whole world with everything on every continent. The world in the garden was still Narnia, so the world within the world, Narnia within Narnia. Each circle is larger and more beautiful than the last one.