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Open the brackets and put the adjectives in the right form (comparative or superlative).

1. Which is (large): the United States or Cana­da? 2. What is the name of the (big) port in the United States? 3. Moscow is the (large) city in Russia. 4. The London underground is the (old) in the world. 5. There is a (great) number of cars and buses in the streets of Moscow than in any other city of Russia. 6. St. Petersburg is one of the (beau­tiful) cities in the world. 7. The rivers in America are much (big) than those in England. 8. The is­land of Great Britain is (small) than Greenland. 9. What is the name of the (high) mountain in Asia? 10. The English Channel is (wide) than the straits of Gibraltar.