Put the verbs in brackets into the correct form and voice historians (still to debate) when the first computer virus really (to appear). we 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.

Historians _are still debating when the first computer virus really appeared. We know a few things for certain, however: the first computer, which _was__ generally considered to have been invented by Charles Babbadge, did not have any viruses. The first computer virus was a program called “Elk Cloner”. It was created by rich Skrenta, a computer programmer who studied  at high school at the time. This virus _was___created in 1982. “Elk Cloner” attached itself to the Apple DOS 3.3 operating system and ___was__ later spred by a floppy disk. When the virus was created, it __was_internationally made as a joke by a high school student, who _input the virus into a game in which the virus  set off after the 50th time of using the game. When the virus set off, a blank screen appeared and displayed a poem about the virus. The computer then became infected.   - не везде уверена. простите, если что не так!