The operating system provides such

____________ as editors and debuggers to help the programmer create programmes.

An operating system must also

possess the ability to ___________ .

The

boot sector of a hard disk may ___________ from the so-called Boot viruses.

By referring to the control

instructions the operating system selects the first program and data ________ to

be processed.

Computer viruses are called

viruses because of their __________ with biological viruses.

Programmers

use the programming software to develop the programming

If one computer in the network

gets infected, others also become infected, causing a chain ________ that can

disorganize the operation of entire network.

Worms can reproduce rapidly,

causing a network to __________ .