阅读下面的短文，在需要的地方填入适当的冠词(a, an, the, /)
little mouse thinks he is the tallest and strongest animal in world. His mother says to him, "Don't say you are the strongest in front of an elephant. He doesn't think so." little mouse doesn't listen to his mother. He goes out to look for elephant, but he doesn't know who the elephant is. He meets ant. He asks her, "Are you elephant?" No, I'm not, "says ant. Suddenly someone says to him, “I'm elephant. Go and climb that tall tree nearby. Then you can see me." "Now I see. The elephant is tallest and strongest animal in the world," says the little mouse at last.