Not until the ______ of Yellowstone Park in the late nineteenth century did the United States have a national park.
Not until the ______ of Yellowstone Park in the late nineteenth century did the United States have a national park.
Not until the ______ of Yellowstone Park in the late nineteenth century did the United States have a national park.
By the 1970's, the wolf had been fully ______ from Yellowstone National Park, but by 2002, reintroduction efforts resulted in more than 160 wolves again inhabiting the park.