阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Helen Keller was an (exceptional) special girl. When Helen was young, she lost her sight and hearing. With these (restrict)to her communication, Helen's behaviour was often (bear). She had tendency to break things she was not understood. Anne was a superb teacher. Her technique was simple and straightforward. She would let Helen play the doll and then spell the letters D-O-L-L on her hand. From "doll" to "water", Helen's knowledge and vocabulary (expand), and this changed her (think) process. As she (grasp) the key to language, she discovered more complex words. Helen finally understood the beautiful (true)of the word "love".