综合填空
David Braden from England invented a small computer. It is as b____ as your thumb(拇指).It is only ＄25.It’s such a small computer ,it can’t w_____ by itself. The computer needs touch s______(显示屏) to help it work. And it also needs a k______ to type. Though you can’t use the computer to play g_____, it can do some j_____ like the computers do .The students can use them to send e______, study from the Internet. It isn’te______. So it will be a good friend to the poor students. You can buy the computers as early as next year. With theh______ of the computer, the students can know m_____ about the world and study well.