If we try to think of the most important inventions in the 20th century, I think electricity may{#blank#}1{#/blank#}(is) the most important, in a way. It plays {#blank#}2{#/blank#}important part in the development(发展) of the modern world. It can affect(影响) everyone's life. When the electricity {#blank#}3{#/blank#}(go) off, we call it a power cut. Can you imagine what {#blank#}4{#/blank#}(we) life will be like{#blank#}5{#/blank#}(with) electricity?

    Almost everything will stop. Electrical appliances(电器) can't work, traffic lights are dead, many workers must stop{#blank#}6{#/blank#}(work)and so on. Electricity is so{#blank#}7{#/blank#}(importance), {#blank#}8{#/blank#}it is also limited.

    {#blank#}9{#/blank#}should we do? At least(至少)，we{#blank#}10{#/blank#}(must)waste electricity.

—________ you practice, ________your listening will be.