| 1.The most important program on any computer is ( ). |
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| 2.（ ）：A series of instructions(commands) performed in a sequence specifying actions to accomplish a task. |
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| 3.Very long, complex expressions in program are difficult to write correctly and difficult to （ ） . |
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| 4.Programs written in all other kinds of languages are translated into ( ) before they are performed. |
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| 5.All modern （ ） are multitasking and can support running several processes simultaneously. |
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| 6.（ ）：The process of identifying and correcting errors in a program. |
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| 7.The two goals of an operation system are （ ） and efficiency. |
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| 8.As an operating system repeatedly allocates and frees storage space , many physically separated unused areas appear. This phenomenon is called （ ） . |
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| 9.The user must interact with the （ ） in order to accomplish task. |
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| 10.( ) is a fast and powerful operating system, based on the UNIX O.S. |
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| 11.( ) drives can erase and store data. |
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| 12.( ) refers to the parts of the computer that you can see and touch. |
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| 13.Insufficient （ ） can cause a processor to work at 50% or even more below its performance potential. |
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| 14.A （ ） consists of the symbols,characters, and usage rules that permit people to communicate with computer. |
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| 15.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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| 16.Single program operating systems allow ( ) user(s) to run ( ) program(s) at one time. |
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| 17.（ ） is the foundation on which applications are built. |
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| 18.（ ）：An error can be caused by attempting to divide by 0. |
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| 19.The program and the data are kept inside the computer in a place called （ ）. |
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| 20.A （ ） is a functional unit that interprets and carries out instructions. |
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