Probably you have seen someone reading a book on an electronic reading device. Over the past few years, these small computers have become more popular. For that reason, more companies that make     paper books are now making electronic books (e-books). Most e-books are the same as paper books,     people download a file into a reading device rather than     the paper book. This way they can     many books.
Books companies are adding special features     some e-books. These extra features might include sound files, picture files, or video files. When the readers click on these files they learn more about the book, the story, or the writer.
The latest electronic readers are smaller and    , but they are also much more powerful. They can store much more information, so writers and book companies can do more with     e-books. They do not want to just add files to     completed book. They are making the sound, picture, and video files part of the story. Readers need these files to understand the whole story. Readers can     change the story.
Readers already have a lot of books to     from. If they can change the way stories end, they will have more choices!