This is my second year teaching K. I love it, and have learned so much from last year. I would like to vamp up my center time. While I am doing Guided Reading with two or three groups per day(90 minute block), what centers do you find you like that keep the other's attention? I have no aide, and I am trying to come up with centers that they can work at independently. We are not allowed to have a kitchen, blocks, art-except if it goes with a story, etc... In the centers that work for you, what activities do you have in them, and how often do you rotate centers? Thanks for all your help!