根据短文内容，用if, although, as soon as, unless, so ... that填空，使短文完整、通顺。
On his birthday Martin got a book from his father. He felt sad he didn't talk too much. His father noticed this and said, "Cheer up, Martin! It's a magic book. you want to find out its magic, you'll have to read it."
Well, that was good. Martin liked everything to do with magic. He started reading it, he wasn't very interested. The next morning, his father asked him, "Have you found the magic key?"
"No. I turned the pages of the book quickly, but there was no sign of the key." Martin replied. His father said, "You won't find the magic out you read the book carefully."
Martin wasn't patient (有耐心的) enough, and he stopped reading the book. One day his sister asked him for the book. She wanted to read it. Several days later, the girl finished the book, she happily shouted, "I've found it, the key of the magic book!" So Martin started to read the book again. At first it was a pain (痛苦). But, gradually (逐渐地), Martin got interested in the adventurous (有冒险精神的) Prince's life. Then, suddenly, he was there. The book itself was the key! Whenever he opened it, he felt he was taken to (被带到) its mountains and seas.