我的电脑行为异常，我怀疑是病毒。

My computer has been acting strangely, and I suspect it's a ___virus.

那个文件是病毒，并删除了我电脑上的所有文档。

That document was a ___virus and erased all my documents on my computer.

始终使用防病毒软件保护你的电脑免受病毒侵害。

Always use antivirus software to protect your computer from a ___virus.