Use the,a,-(no article).
1 Olga lives in ... Russia.It is ... very big country.
2 He cant speak ... German.If he goes to ... Germany,he'll need ... translator

Lives in Russia;It's a veru big contryHe can't speak GermanIf he goes to GermanyHe'll need the translatorИзвини,но я не уверенна

Olga lives in Russia, it's a very big country. I can't speak german, if u go to germany he will need a translator