从下面提供的答案中选出应填入下列英文语句中______内的正确答案。 The computer itself does not do all the work on its own. The work is done by a (1) of the computer, called hardware, and (2) ofinstructions, called software or computer programs. Inside the machine, the instructions are (3) and carried out to do the work you want to do. A computer without software is nothing more than a mass of metal and plastic. On the other hand, software without a computer is simply wasted (4) because only the computer can use the software and put it to work. When you talk about a computer's being able to do this or that, you are really refemng to the (5) that accepts your commands and the computer that carries them out.