СРОЧНО!!!!!!!!
Put the verbs in brackets into the correct form and voice
Historians ____ (still to debate) when the first computer virus really ___ (to appear). We _____(to know) a few things for certain, however: the first computer, which ___ (generally to consider) to have been invented by Charles Babbadge, _____ 9not to have) any viruses. The first computer virus ____ (to be) a program called “Elk Cloner”. It _____ (to create) by rich Skrenta, a computer programmer who ___ (to study) at high school at the time. This virus ____ (to create) in 1982. “Elk Cloner” ____ ( to attach) itself to the Apple DOS 3.3 operating system and _____ (later to spread) by a floppy disk. When the virus ____ (to create), it ______ (internationally to make) as a joke by a high school student, who ____ (to input) the virus into a game in which the virus _____ (to set) off after the 50th time of using the game. When the virus _____ (to set) off, a blank screen __ (to appear) and _____ (to display) a poem about the virus. The computer then ____ (to become) infected.