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 1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。

Reading as a teen leads to success. When teens read more than just their classroom assignments, research clearly shows that they generally do 1. (good) in school. First of all, the extra reading 2. (enlarge) their vocabularies. And teens 3.  read more serious literary works gain skills in handling complex ideas. Besides, teens can educate 4. (they) in any area of life they are interested in if they are good at reading. Plus, reading also helps them expand their horizons as they learn more about people and the world.