题目内容：

阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写一．个．适当的单词， 在给出提示词的空白处用括号内所给词的正确形式填空。

One day, when I was a freshman in high school, I saw a kid from my class walking home from school， 1. (carry) all of his books. A bunch of kids were running toward him, knocking all his books out of his arms and making him land in the dirt. His glasses went flying, and I saw them land in the grass about ten feet from him. He looked up and I saw this terrible 2. (sad) in his eyes. So, I ran over to him and 3. (hand) him his glasses. He   looked at me and said, “Hey thanks!” There was a big smile on his face, 4. was one of  those smiles that showed real gratitude.