If you could please include a little more about the question, you could get a more reliable answer.
Answer:
of course, the girls couldn’t wait to jump in the pool on such a hot day.
Explanation:
when you have an introduction to a sentence like ‘of course’, you’ll want to take a pause after saying it. that means that you need a comma. if you read through all of the sentences provided out loud, you’ll notice that some of the pauses are not needed. hope this helps!
