Answer:
I am nothing but holes tied to holes, yet am strong as iron.
In the land of the green glass door there are riddles but no answers, sheets but no blankets, and books but no words. Name something found in the land of the green glass door.
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
What covers its face with its hands, speaks no language, yet most known what it's saying?
What has a single eye but cannot see?
People take me on walks and I run and have fun. What am I?