B Johnny Smith was a good maths student at a high school． He loved his computer．He came home early every day， then he worked with it till midnight． But Johnny was not a good English student， not good at all． He got an F in his English class． One day after school， John’ ny joined lus computer to the computer in his high school office． The school office computer ．had the grades of all the students: the maths grades， the science grades， the grades in arts and music， and the grades in English． He found his English grade． An F! Johnny changed his Eng’lish grade from F to AJohnny's parents looked at his report card． They were very happy． ''An A in English! said Johnny's Dad， 'You're a very clever boy， Johnny．Johnny is a hacker（黑客）． Hackers know how to take information(信息) from other computers and put new information in． Using a modem(调制解调器) ， they join their computers to other computer secretly． School headmasters and teachers are worried about hackers， so are police， for some people even take money from bank computer account(帐户 ) and put it into their own ones． And they never have to leave home to do it! They are called hackers． ( )26． Johnny changed his English grade with the computer in ________