QUESTION: Fix punctuation: Complete all three levels as fast as you can to be the best in the world Get the highest score
ANS: Complete all three levels as fast as you can to be the best in the world! Get the highest score.

QUESTION: Fix punctuation: Repeat decrease until there are 6 dc left
ANS: Repeat decrease until there are 6 dc left.

QUESTION: Fix punctuation: I am becoming more and more happy on this way of sanctification and I know that my joy will extend right into eternity for me after I die
ANS: I am becoming more and more happy on this way of sanctification, and I know that my joy will extend right into eternity for me, after I die.

QUESTION: Fix punctuation: Edited by Lise Hannestad and Vladimir F Stolba
ANS:
Edited by Lise Hannestad and Vladimir F. Stolba