| 1.Single program operating systems allow ( ) user(s) to run ( ) program(s) at one time. |
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| 2.The two goals of an operation system are （ ） and efficiency. |
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| 3.（ ） 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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| 4.（ ）：The process of identifying and correcting errors in a program. |
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| 5.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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| 6.( ) is an operating system that was initially created as a hobby by a young student. |
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| 7.The （ ） has several major components, including the system kernel, a memory management system, the file system manager, device drivers, and the system libraries. |
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| 8.The term " （ ） program" means a program written in high-level language. |
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| 9.（ ） is the foundation on which applications are built. |
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| 10.Very long, complex expressions in program are difficult to write correctly and difficult to （ ） . |
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| 11.（ ）：A series of instructions(commands) performed in a sequence specifying actions to accomplish a task. |
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| 12.( ) allow more than one program to be run at the same time on the computer. |
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| 13.Programs written in all other kinds of languages are translated into ( ) before they are performed. |
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| 14.Every valid character in a computer that uses even （ ） must always have an even number or 1 bits. |
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| 15.The user must interact with the （ ） in order to accomplish task. |
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| 16.Insufficient （ ） can cause a processor to work at 50% or even more below its performance potential. |
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| 17.The（ ）is a collection of modules serving as interface between hardware and software to provide a software platform. |
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| 18.The program and the data are kept inside the computer in a place called （ ）. |
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| 19.( ) drives can erase and store data. |
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| 20.A （ ） is a functional unit that interprets and carries out instructions. |
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