source, The river is the _______ of drinking water for the village., She cited a reliable _______in her research paper., The journalist refused to reveal his _______of information., The sun is the primary _______of energy for life on Earth., The teacher asked students to list every _______they used in their essays., resource, Oil is a natural _______that fuels many industries., Time is the most precious _______we all share., Skilled workers are an essential _______for any company., Forests are a renewable _______if managed responsibly., The teacher provided online _______to help with homework., use, The _______of smartphones has transformed communication., This tool has many practical _______in construction., The _______of renewable energy reduces pollution., The pen is of no _______without ink., The _______of GPS helps drivers navigate easily., usage, The dictionary explains the correct _______of each word., The professor corrected the improper _______of tense in the essay., The manual outlines proper _______of the equipment., Slang _______varies across different regions., Historical _______of the term has shifted over centuries..

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