Last Friday, Mrs. Lee asked if I could take her dog Heizi out for a walk. I said1 because I like dogs. A few minutes later, Heizi and I were walking happily to the park.
We were almost there2 a big black dog suddenly(突然) appeared from out of nowhere. Before we could stay away from it, it attacked Heizi. Then the two dogs3 with each other.
It was just terrible. I was so 4 that I was unable to call for help. 5 , someone showed up just then. A boy about my age pulled the black dog off Heizi. The black dog was 6 . He said he was really, really sorry. He promised that a thing like that wouldn't 7 again.
I was still shaking when I got back to Mrs. Nolan's house. Poor Heizi's body was full of 8 . Mrs. Lee drove Heizi and me right over to the animal hospital.
The animal doctor said Heizi should be fine in a few days, but I still felt sorry for not9 it well. Mrs. Lee said it wasn't my fault(过错), because there was nothing I could do at that time. But her kind 10 didn't make me feel any better.
What a terrible day!