Some parts of the process are still (1)________ much a closed book, but it is for the (2)_________ part possible to describe what the child is doing at various stages in its development, even
Some parts of the process are still (1)________ much a closed book, but it is for the (2)_________ part possible to describe what the child is doing at various stages in its development, even if we cannot account (3)________ how exactly it learns to do these things.