an old man had been working for many years for a town. his job was to clear away natural waste from the pool water in the hills, which made up the lovely river flowing through the town nearby. quietly and__1__， the old man guarded the hills，__2__the leaves and branches, and cleaned up the dirt that would have__3__and polluted the fresh flow of water. the town soon became a popular attraction for tourists. elegant swans (天鹅) floated along the clear river and the view was so beautiful__4__words.
years passed. one evening the town__5__met. as they reviewed the budget, one man's__6__caught sight of the资源难易程度:★★★★★★★★★★★★★★★
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