| 1.Single program operating systems allow ( ) user(s) to run ( ) program(s) at one time. |
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| 2.Insufficient （ ） can cause a processor to work at 50% or even more below its performance potential. |
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| 3.To document your code can increse program （ ） and make program easier to maintain . |
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| 4.（ ） is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC. |
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| 5.（ ） is the foundation on which applications are built. |
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| 6.The most important program on any computer is ( ). |
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| 7.When saving a document you must decide on a name for the document and the （ ） where it will be saved to. |
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| 8.Very long, complex expressions in program are difficult to write correctly and difficult to （ ） . |
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| 9.The term " （ ） program" means a program written in high-level language. |
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| 10.( ) allow more than one program to be run at the same time on the computer. |
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| 11.Every valid character in a computer that uses even （ ） must always have an even number or 1 bits. |
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| 12.( ) refers to the parts of the computer that you can see and touch. |
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| 13.A （ ） is a functional unit that interprets and carries out instructions. |
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| 14.（ ）：An error can be caused by attempting to divide by 0. |
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| 15.( ) drives can erase and store data. |
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| 16.The two goals of an operation system are （ ） and efficiency. |
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| 17.When a program has no syntax errors, the compiler finishes ( ) the program, the source code, and generates an object code file. |
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| 18.The user must interact with the （ ） in order to accomplish task. |
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| 19.All modern （ ） are multitasking and can support running several processes simultaneously. |
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| 20.( ) is an operating system that was initially created as a hobby by a young student. |
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