Вместо точек поставьте артикль the или
1) fifth Avenue in New York is one of the most famous shopping streets in the world.
2) The longest river in the world, Nile,is about 6,700 kilometres long.
3) Russia is nearly twice as big as United States of America.
4) Netherlands is a very flat country,with no mountains.
5) lake Baikal in Siberia is the biggest lake in the world.
6) Iceland is a large island in Atlantic Ocean
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