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Most foreign-language teachers are a) non-native and b) nazis. Don't even think about using modern expressions or, God forbid, slang.

My teacher would stop me midsentence for saying чё.[/quote]...

Зрители долго аплодировали артистам. fine
The spectators applauded the artists for a long time.

Нужно заботиться о здоровье. fine
You need to take care of your health.

ВыучИ эту песню...

No way. You must say Родители гордятся своими детьми (Without "soft sign" ь - this is a widespread mistake even amongst russians)