The first one is the correct way to use it, since it separates the parts of the sentence into fragments that can still be understood without changing the meaning of the entire sentence.
Answer:
Dear March, Come in!
Put down your hat.
Explanation:
She is characterizing March as a person who is at her door by saying, "come in" and then who she invites in and tells them to stay by telling them to put down their hat.
Answer:
He
Explanation:
The subject is He because he is being described in the sentence or is talked about.
I hope it helps! Have a great day!
Muffin ^^
The answer is belief it all adds up