Credit card used to prepay the room must be presented upon arrival

Can you repeat this sentence, but add in punctuation?
Credit card used to prepay the room must be presented upon arrival.
Before you can open a DATA5 file youll need to figure out what kind of file the DATA5 file extension refers to

Can you repeat this sentence, but add in punctuation?
Before you can open a DATA5 file, you'll need to figure out what kind of file the DATA5 file extension refers to.
Denmark joined the ASPnet in 2000

Can you repeat this sentence, but add in punctuation?
Denmark joined the ASPnet in 2000.