"practice shows" is correct and can be used in written English.
This expression is often used to refer to experience that confirms something is true, such as "Practice shows that hard work pays off."
Practice shows that the system can meet the practical needs of information security assessment.
His lack of match practice shows.
A video of the practice shows her writing various statements with the blood, such as "with a sharp knife cut deeply into your middle finger eat the pain".
My own research and working practice shows, if anything, that ADHD is underdiagnosed and under-treated in at least some localities in the UK.
The resource, Weaving Communities of Practice, shows the relationship between textiles, culture and identity in the Andes from 600 CE to the present.
Not everyone, he added, responds as well to cleaning and antibiotics, and clinical practice shows that surgery remains the best way to treat periodontal disease.
As practice shows, all changes for the better have taken place in Russia 300 years after these changes took place in Europe".
The theory of deliberate practice shows that it's not your language learning talent that makes the difference, but the amount of time you spend in concentrated and deliberate practice.
This practice shows remarkable openness and self-confidence, and it suggests something very different from the neurosis and narcissism so often ascribed to writers who draw from the reservoir of the self.
Traffic is an especially sore issue in Moscow: although world practice shows that more roads simply lead to more cars, Mr Sobyanin is proceeding with the disruptive and unpopular construction of a new multilane highway through northwest Moscow.
