6. A. turn off B. turn on C. break down D. break upPassage 3:
Electricity is the (1) __________common form of energy used today. (2) __________the modem world,
(3) __________is instantly available at the touch of a switch. Electricity has numerous uses. The most
common use of electricity is to provide artificial lighting. In factories, electricity is used to (4)
__________the electric motor of machines. In offices, electricity is used to light up (5)
__________workplace. It is also used to operate air-conditioners, computers (6) __________many other
machines.
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