Fill in the articles when necessary.
1    Do you know where ... Mississippi is? Is it in ... South America or in ... North America?
2    One of the natural attractions in ... Canada is ... Lake Superior — millions of tourists come ю see it.
3    — What is the longest river in the world? Isn't it ...Thames?
— No, nothing of the kind. It's ... Amazon. This river is in ... South America. It flows into ... Atlantic Ocean on the north coast of ... Brazil.
4    ... Fuji is an extinct volcano and the highest mountain of... Japanese Islands.