Ⅰ.完形填空
(2015·江苏常州市二模)Long long ago a circle missed one piece of its own. The circle wanted to be whole, so it went around looking for its __1__ piece. But because it was __2__ and therefore could roll only very slowly, it __3__ the flowers along the way. It __4__ with the worms. It enjoyed the sunshine. It found lots of different pieces, but __5__ of them fitted. So it left them all by the side of the road and __6__ searching. Then one day the circle found a piece that fitted __7__. It incorporated (合并) the missing piece into itself and began to roll. __8__ it was a perfect circle, it could roll very fast, __9__ fast to notice the flowers or talk to the worms. After it realized how different the world seemed when it rolled so quickly, it __10__， left its found piece by the side of the road and rolled slowly away.
