Why didn’t my teacher believe(相信) me? I’m a good student. I really did all my homework last night, though I don’t have it now.
My teacher knows I’m busy these days.      I’m on the basketball team and have to practice after school every day.     
Where is my homework? I have to say, my dog ate it.
Here is the story: Last night, I went home late and was really tired after practice. However, I didn’t forget to do my homework. I ate dinner and did it at the time. When I finished it, I suddenly dropped some meat on my paper.        What should I do? It was too late, I couldn’t do the homework again on another piece of paper.     Later, my dog Max, who loves meat very much, jumped up onto the table and ate my homework!
My teacher said it was an old story.      It is true this time, but no one believes me.