Choose the suitable word to fill in each plank.

THE GRAND CANYON

The Grand Canyon in the United States was created by the River Colorado. People visit the Grand Canyon Park to go walking and running but (21)__________ to look at the view. It is a wonderful view made

(22)______better by the Skywalk. The distance (23)_________ the Skywalk to the bottom of the Grand Canyon is 1219 metres. It is a platform (24) ________ walls and floor are built of glass (25)____________ that you can see the beautiful rocks of the canyon. Up to 120 people are allowed to stand on it at the same (26)_______.It opened in 2007 and since (27)_________ thousands of people have used it. You have to (28) special covers over your shoes to (29) _______scratching the glass beneath your feet. Walking onto the Skywalk makes you (30)_________like a bird floating high up in the air.

Choose the word which has the underlined part pronounced differently from the rest.