填空题 In the past fifty years the invention of 1 devices and appliances has made housework much easier. Among these devices and appliances are 2 cleaners, electric irons, washing machines, and some others. Probably the most important piece of 3 equipment which has been widely used in the last twenty years is the 4 . Washing up by hand is not only 5 but also extremely boring. Dishwashers are of different sizes and 6 . Their capacity ranges from six to 7 place-settings. After the dishwasher is plumbed into the mains 8 supply, all you have to do is to load dirty dishes, glasses and 9 into the machine, pour in some special
10 , close the door and 11 it on. The machine will wash almost everything except the large 12 and dishes with scraps of 13 food. It also 14 the plates and glasses with its own heat. If your dishwasher is 15 or larger, probably you need to wash up only 16 a day. Of course this means you have to have 17 dishes, glasses and cutlery to last three or four 18 . Remember that dishwasher can be quite 19 , so you may prefer to use the machine just once a day, preferably 20 thing at night.