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 Put the necessary article(a,the,-)
He cant speak...German.If he goes to...germany,hell need...translator
...longest river in the world is...Nile

...largest ocean in the  world is Pacific ...Ocean
The founder of...Tretyakov Gallery was Ivan Tryakov
I want to show you...Red Square and...Kremlin
Forests and oceans are parts of...environment
the most famous Moscow theatre is ...Bolshoi Theatre