Add punctuation: The AppsKey part lists all supported keyboard keys and mouse buttons that ShowOff echoes when they are activated
A: The AppsKey part lists all supported keyboard keys and mouse buttons that ShowOff echoes when they are activated.

Add punctuation: Dumbbell Set ca 15kg 78 Customer ratings
A: Dumbbell Set ca. 15kg 78 Customer ratings

Add punctuation: It is one book
A:
It is one book.