Essential-Unit 6-Ecotourism

v. , to work for no pay; freely offer to do something

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n. , a group of things that have something in common

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n , a custom, method

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adj . , far away

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v. , to prevent from happening; stay away from

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n , collection and treatment of trash for reuse

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n. , idea

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n , activity that makes something known to the public

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n . , something that blocks or separates

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n. , a place to stay such as a hotel

(a)