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       In this unlikely place, researchers are putting the seeds from flowering plants and trees in a sleeplike state.Many years from now, other workers will wake the sleeping seeds up to plant them

       1  they are most needed.These seeds are  2  the legendary Rip Van Winkle, who fell asleep under a tree and woke up 20 years later.

       The small farm, called the Greenbelt Native Plant Center, is part of a global effort to save  3 threaten) plants and trees.Around the world, native plants are being crowded out by invasion newcomers.Native plants have less room to grow now   4   a result of the growth and spread of cities.And global warming is making some places hotter, drier, or different from  5   native plants are used to.

       Experts used to think  6  possible to protect big-city plants such as American bittersweet because growth space is limited in urban environments.Crowding increases competition between natives and invaders, and the latter often win the battle.

       7  , scientists have found ways  8  fighting back.So far, workers at the Greenbelt Native Plant center   9   (gather) seeds from about 300 of those plants and put them in a sleeplike state.When  10  (plant) in the future ,these seeds could help restore damaged parkland and forests.

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