"Dobles a la derecha" is a formal way of saying, "Turn right".
The command is grammatically correct.
Ustedes (sujeto ) cierren (v). La (art)..
Abandonar is the translation
ella trabaja con cuidado should be the way to say it in spanish
Mal means improper manner
The opposite of this is a happy manner which refers to Bene
So the opposite of "mal" is "bene"