QUESTION: Fix punctuation: Before you can open a ZLA file youll need to figure out what kind of file the ZLA file extension refers to
ANS: Before you can open a ZLA file, you'll need to figure out what kind of file the ZLA file extension refers to.

QUESTION: Fix punctuation: When he was eight years old it is recorded that he built a model of a water mill Bedini writes in 
ANS: When he was eight years old it is recorded that he built a model of a water mill. Bedini writes in :

QUESTION: Fix punctuation: as frequently as Id like yours is an invaluable service
ANS: as frequently as I’d like, yours is an invaluable service!

QUESTION: Fix punctuation: This is the hardest test weve run
ANS:
This is the hardest test we’ve run.