Punctuation. Is it necessary to add a comma (commas)? (source: owl.purdue.edu)

The girl with the bright, friendly smile wore a bright green scarf to celebrate St. Patrick's Day.

The girl with the bright friendly smile wore a bright green scarf to celebrate St. Patrick's Day.

If the opposition should win our candidate would never have any political future.

If the opposition should win, our candidate would never have any political future.

Did you know that James Agee, the novelist and poet, was also a film critic?

Did you know that James Agee the novelist and poet was also a film critic?

Tomorrow, I believe, is the last day to register to vote in the November general election.

Tomorrow I believe, is the last day to register to vote in the November general election.

To perform well on Saturday afternoon the athlete must train every day of the week.

To perform well on Saturday afternoon, the athlete must train every day of the week.

Having cut the roses, she decided to bring them to her friend in the hospital.

Having cut the roses she decided to bring them to her friend in the hospital.

"When" Jaime asked "will you return my book?"

"When," Jaime asked, "will you return my book?"

Understanding history, increases your understanding of today's world.

Understanding history increases your understanding of today's world.

We went to Bar Harbor, but did not take the ferry to Nova Scotia.

We went to Bar Harbor but did not take the ferry to Nova Scotia.

Some people refuse to go to the zoo because of pity for creatures that must live in small cages.

Some people refuse to go to the zoo, because of pity for creatures that must live in small cages.

Celene who does not usually tell anyone what she feels said she didn't want to go to the dance.

Celene, who does not usually tell anyone what she feels, said she didn't want to go to the dance.

When the intermission was over the members of the audience moved back to their seats.

When the intermission was over, the members of the audience moved back to their seats.

Jillian who had worked in the dress shop all summer hoped to work there again during the Christmas holidays.

Jillian, who had worked in the dress shop all summer, hoped to work there again during the Christmas holidays.

After eating the dog's dinner, Frisbee ate his own.

After eating the dog's dinner Frisbee ate his own.

Thomas Paine's pamphlet appeared in Philadelphia Pennsylvania, on January 9 1776.

Thomas Paine's pamphlet appeared in Philadelphia, Pennsylvania, on January 9, 1776.

Which sentence is correct?