I tested their knowledge of Russian language and has received four:
Go check it out?
You answered 6 out of 8 simple questions. Not a bad result against the general background. Chances are, you know bad Russian language at school, just had it long ago, and now the textbook for you Rosenthal replaces grammatical AutoCheck in "Word". Proud of you especially have nothing, but to survive in the environment of Russian native speakers of that is enough. Such as you, in country, according to opinion poll - 21%.
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Go check it out?