题目内容：

根据上下文和中文提示，用单词的适当形式填空，使文章完整、通顺。（每空限填一词）

Apple has entered the textbook market. The company_____1._____(介绍) iBooks textbooks four years ago. iBooks textbooks are digital books in different subjects， ____2._____(包括) science ， math， history  and ___3.____(地理). The company__4._  (提供) a collection of textbooks for high school students. It offers a “new textbook experience” and suggests that the interactive iBooks textbooks___5._(本身) are “the next chapter in learning.” It sounds like good news for students. Think of it. No more carrying heavy backpacks _6._(满) with textbooks. Every textbook you need can be 7.__(储存) on your iPad. No more having to buy expensive textbooks which you will only use for a year or two and then sell or give away. Of course there’s a  hidden problem. You need to own an iPad and as you know， it is not cheap. You also need to buy digital textbooks， mostly priced each at $14.99 (94.74 yuan) or _8.__（更少）.Textbook publishing was _9._(值) $ 8.7 billion in the US alone last year. And the rest， as they say， is history.

Will Apple revolutionize learning? Will digital books take over ___10.__ (完全) in education? That remains to be seen.