My name is Lily. This is my classroom. There are 40 desks, 40 chairs, a bookcase, a computer and a teacher's desk in it. It has two green doors and four windows. There's a clock and a map on the wall . Look, that is Kate. She is my friend. A red bag, three black pens and four green pencils are on her desk. My favourite day is Saturday. We have no classes on Saturdays and Sundays. The doors are   _  .
green red white blue