Electricity is the most common form of energy used today. In the modern world, (42)_________ 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 (43)_________ the electric motor of machines. In offices, electricity is used to light up (44)_________ workplace. It is also used to operate air-conditioners, computers (45)_________ many other machines.
42. A. gas B. water C. electricity D. coal
43. A. driven B. drive C. driving D. drove
44. A. a B. any C. the D. many
45. A. but B. so C. because D. and
42C
43B
44C
45D
42-C
43-B
44-C
45-D