the classroom doors burst open. From all the classrooms, students poured out like a swarm of bees. There doesn't seem to be a single student left in the class. They all fell on the schoolyard. After two hours of intense concentration, at recess, everyone felt excited because they could run and jump, talk and laugh. Soon the schoolyard was filled with sounds. Now no one can hear the birds singing, the wind whispering anymore. All there is only shouting, laughter, pounding footsteps echoing everywhere like a vibrant music. The games were really exciting. In the middle of the field, the boys played soccer. A group of ten friends stand in a circle. The ball on your feet flies back and forth like a white swallow's wings dancing on rhythmic feet. Under the milk flower that has just blossomed, a group is stooping to shoot marbles. The colorful marbles rolled and collided with each other and rattled, which was very pleasant to the ears. The noisiest are those who play catch. It seems that after more than an hour in class, now we can have fun again, all of you are running as if you don't know how to get tired, let's run. Everyone's face is as red as gac, sweat beaded on their forehead. You both chased each other and called each other. Some of you have been knocked down. However, no one complained, only saw a series of non-stop crunching laughte---cho-xin-hay-nhất-ạ