Read the following passage carefully and use one of the following words to complete each numbered blank:

      Electricity is the most common form of energy today. In the modern world, electricity is very (25) ___________ at the touch of switch. Electricity has many uses. The most common use of electricity is to (26) ___________ artificial lighting. In factories, electricity is used to light up the work place. It is also used to operate air-conditioners, computers and many other machines. Electricity is also used to power many appliances (27) ___________ we have in our homes. Such appliances include television sets, computers, electric fans, irons and many others. The list is simply endless. Modern man will most probably be lost (28) ___________ electricity.

(27).............

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