Complete the sentences with the correct siperlative form of the adjectives 
Interesting, Polluted, Amazing, Beautiful, Valuable, Difficult, Boring, Delicuous.
1. Prague is ________ city I've ever seen.
2. What's ________ book you've ever read ? - Harry Potter and the Sorcerer's Stone. I really love it !
3. The Grand Canyon is ________ sight I've ever seen.
4. Many climbers consider K2 is ________ mountain to climb, not Mount Everest.
5. That was ________ movie I've ever seen. I almost walked out in the middle.
6. Please give me your recipe. That is ________ cake I've ever asten.
7. Fresh air doesn't exist in New Delhi at the momment. It is ________ city on Earth right now. 
8. That is ________ painting in the art gallery. It's world a million dollars.