Probably you have seen photos of the Grand Canyon. But you must go there ____（1）____ to feel its size and beauty. The Grand Canyon is one of the greatest ___  (1)  ___ wonders of the world.

   The Colorado River made the Grand Canyon over millions of years. Slowly, the river cut down ____  (2)  ____ hard rocks. At the same time, the land was ___  (3)  ___. Today the canyon is very ____  (4)  ____. It's also very wide, about 20 kilometres. And ____  (5)  ____ its height, there are different kinds of plants and animals on both ____  (6)  ____ of the canyon.

   The canyon looks different at different times of the day, and ____  (7)  ____ different seasons and weather. At sunrise, the red, gold, brown and orange colours of the rocks are ____  (8)  ____ clear and bright. Whether you see the Grand Canyon from the top or the bottom, it will be a(n) ____  (9)  ____ that you will never forget.