一個玩笑 A Joke

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I am a naughty boy. Yesterday I played a joke on my classmate, Mark. When we all busied doing homework, I draw a picture of dog and wrote a sentence in the bottom,” I am a dog.” And then I carefully put it on the clothes of mark. Mark sat in front of me, so I can make this things achieved easily. When he stood up to answer our teacher’s question next class, everyone saw this and laughed, including the teacher. He felt embarrassed at first, but later he laughed with us. 
我是一個調皮的小男孩。昨天我跟打我的同學，邁克開了一個玩笑。當我們都忙於做作業的時候，我畫一隻狗並在底部寫了一句話，“我是一隻狗。”然後我小心翼翼地把它貼到邁克的衣服上。馬克坐在我的前面，所以我很容易地就把事情做好了。當下節課他站起來回答老師，每個人都看見了，也都笑了，包括老師也笑了。他一開始感到很尷尬，但後來他也和我們一起笑了。