Choose the right grammatical form in each gap to complete the text.

Last night I saw an unusual dream. I was in the jungle. It was dark and scary. There was a big tree. There was a big hollow in the tree. In the hollow, it was lighter than in the jungle. I looked inside and saw three eggs. One egg was small. The second was lighter than the first one. And the third egg was the lightest. Suddenly, the eggs started to crack. Three animals hatched out of the eggs. The first one was the lightest cat I've ever seen.