读下列短文，选择正确答案。

   Today was hot. I went to the farm with my parents. There was a river near the farm. I went to the river with my dog. We ran and played. Suddenly I dropped(掉进）into the river, "Help , Help……" My dog jumped into the river and swam to me, Ten minutes later, I was saved(救). I was grateful to him. We are good friends.