Add punctuation: Standard stock solutions of each compound were prepared in 100 of acetonitrile at a concentration of 1mgml
A: Standard stock solutions of each compound were prepared in 100% of acetonitrile at a concentration of 1mg/ml.

Add punctuation: Playing online Front of Shop Dressup game This is Girl game Nearby the game there are similar Girl games Enjoy with free Front of Shop Dressup game
A: Playing online Front of Shop Dressup game . This is Girl game . Nearby the game, there are similar Girl games . Enjoy with free Front of Shop Dressup game

Add punctuation: TheOnline Linguistic Support OLShas been designed to assist Erasmus mobility participants in improving their knowledge of the language in which they will work study or volunteer before and during their stay abroad in order to ensure a better quality of learning mobility
A:
TheOnline Linguistic Support (OLS)has been designed to assist Erasmus+ mobility participants in improving their knowledge of the language in which they will work, study or volunteer, before and during their stay abroad, in order to ensure a better quality of learning mobility.