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1 Which is (large), the USA or Canada
2 What is the name of the (big) river in Russia
3 Moscow is the (large) city in in our country
4 There is a (great) number of motor-cars in the streets of Moscow than in Penza
5 St.Petersburg is one of the (beautiful) cities in the world

1 Which is larger, the USA or Canada2 What is the name of the biggest river in Russia3 Moscow is the largest city in in our country4 There is a greater number of motor-cars in the streets of Moscow than in Penza 5 St.Petersburg is one of the most beautiful cities in the world