题目内容
It feels better to do what one can to reduce _________ and waste, but how much is enough?
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Street lamps, _________ signs and floodlit monuments all send light into the atmosphere, obscuring the much fainter stars.
With the development of industry, many more beautiful rivers are badly polluted, but _________, people now are trying to solve the pollution problems.
The oil industry says it’s already reducing greenhouse gas _________ in the electricity sector as coal plants have been switched to natural gas stations.
Having practiced so many times, I feel very ________ of my ability to deliver the presentation successfully.
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