Use prepositions or adverbs if necessary: 1) canada is the world’s second largest country. it occu­pies the whole ... the northern part ... the north american continent. it is washed ... the pacific ocean ... the west,... the arctic ocean ... the north, and ... the atlantic ocean ... the east. it borders on (граничит) the united states ... the south. canada has nearly 15 percent ... the world’s fresh water surface (поверхность). there are so many lakes ... canada that they have never been counted. the climate ... the eastern and central parts ... canada is continental... hot summers and cold winters, but... the south­western and southern parts ... the country the climate is mild. canada’s forests are one ... her greatest resources. 2) the language ... australia is english. the climate ... australia varies... tropical... the cool and temperate. australia is the driest continent... the earth. about one half... its terri­tory is occupied ... deserts (пустыни) and semideserts. the commonest trees ... australia are the eucalyptus, ... which there are over 500 kinds. there are also ocacia or mimosa, which is the national emblem ... australia. even stranger than plants are the animals. there live kangaroos, duckbills (утконосы), koalas (or koala bears) and a great number... dif­ferent birds, parrots... them.

1. Canada is the world’s second largest country. It occupies the whole of the northern part of the North American continent. It is washed by the Pacific Ocean in the west, by the Arctic Ocean in the north, and by the Atlantic Ocean in the east. It borders on the United States in the south. Canada has nearly 15 percent of the world’s fresh water surface. There are so many lakes in Canada that they have never been counted. The climate of the eastern and central parts of Canada is continental with hot summers and cold winters, but in the southwestern and southern parts of the country the climate is mild. Canada’s forests are one of her greatest resources.
2. The language of Australia is English. The climate of Australia varies from tropical to the cool and temperate. Australia is the driest continent on the earth. About one half of its territory is occupied by deserts and semideserts. The commonest trees in Australia are the eucalyptus, of which there are over 500 kinds. There are also acacia or mimosa, which is the national emblem of Australia. Even stranger than plants are the animals. There live kangaroos, duckbills, koalas (or koala bears) and a great number of different birds, parrots among them.

Please let me know if you would like to verify any specific grammatical rules used for these geographical prepositions.