Frightening

At the night, when I was studying at school, the sky looked looked just like it does on a normal weekday. Our classroom was still quiet as usual. While we were focused on our work, something happened. Suddenly, the whole building started shaking and the floor moved up and down. All at once, my classmates started to scream and run out of the classroom as fast as they could. The books on the bookcase began to fall and all the junk were fell from the garbage and fell over the floor. After thirty seconds, it was still shaking and the yelling hadn't stopped yet. I was afraid that our old school couldn't withstand this hard attack. I also wanted to escape right away, but our wise teacher asked us to calm down. Soon it stopped, but I won't forget this experience for the rest of my life.