阅读填空（共10小题，计10分）
阅读下面的短文，在空白处填入适当的内容或括号内单词的正确形式（每空不多于三个单词）。
E-book is short for electronic (电子的) book. It is usually read on    (person) computers. Some mobile phones can also be used to read e-books.
Earlier e-books were written for a specific group of    (read) and were about only a few subjects. the development of the internet, knowledge and answers to a lot of questions mainly come from e-books. This is  the e-book business is increasing quickly.
E-books have many advantages. First, they save time. We don't need to go to a bookstore to buy books, besides, we can find the topic we want to know about on the Internet,    then we can quickly get many e-books on similar topics.    (two), e-books save money. Some e-books cost a little money, and there are millions of e-books on the Internet that we can get for free. Third, more trees are saved because e-books don't need to be printed(印刷) on paper. Fourth, e-books make reading    (convenient). You can carry a whole library of hundreds of books with you in a small computer or any e-book reader (电子阅读器) without worrying about their weight.
    e-books have certain disadvantages. They need a personal computer  an e-book reader and the information can be lost if its file format (文件格式) is not supported or changed in the reader's computer. However, e-books provide    (we) with a new way of reading. That is good.