An application used to keep unauthorized users from

accessing parts of a network or computer

To change the

cartridge, you have to lift the ____________.

We have to make a __________________ ( = a copy) of this database.

I think some paper is

____________ inside the printer.

I turned off the

photocopier and ___________ the plug.

What is computer networking?

Which two types of commonly used printers are?

There are five ______________________ in

programming.

The new external Skype phone can __________________________ ( = can be

used) as both a telephone and a webcam.

. I have to __________

a computer screen for eight hours a day.