yes
The correct past tense verb is hid.The correct present perfect verb is has hidden.
follow your parents
The correct answer is "will have hidden".
The secret message hidden inside the toilet tank is a note that reveals important information or instructions.
In Venice, after you fly in Da Vinci's flying machine you get a codex page that is the instructions for the hidden gun.
The correct spelling is mysterious (secret, hidden, unexplained).
That is the correct spelling of "disguise" (a mask or camouflage).
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A periscope is a device used for seeing a correct image from a hidden place
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Depends on what the virus actually did to hid them. For instance, if you name a file with a leading . then the file is hidden. For example: .apple.txt would be a hidden file. If you enable hidden files to be shown that might do it.
That is the correct spelling of "ulterior" (hidden, concealed).