Final answer:
The sentence that requires the correct punctuation is: 'To truly appreciate Groundhog Day, it's best to find out whether or not a groundhog is asleep.' with the comma placed after the introductory expression.
Step-by-step explanation:
The correct punctuation for the statement would include a comma after the introductory phrase. Therefore, the sentence should read: 'To truly appreciate Groundhog Day, it's best to find out whether or not a groundhog is asleep.' The comma helps to separate the introductory expression from the main clause, making the sentence clearer and easier to read.
Examples of applying correct punctuation in other sentences include:
After the introductory phrase: 'Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy.'
Before a coordinating conjunction that joins two independent clauses: 'I finally found my keys, and I got to work just in time.'