Open the brackets and put the adjectives into the right form

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

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.