Answer the questions at the end based on the text.

HOLLYWOOD, California (CNN) -- Singer Christina Aguilera joins fellow Grammy Award winners Alicia Keys and John Legend for "CNN Heroes: An All-Star Tribute," airing Thanksgiving night on CNN.

Christina Aguilera performed her hit single "Beautiful" at "CNN Heroes: An All-Star Tribute."

The show, taped before an audience of more than 2,000 at the Kodak Theatre in Hollywood, pays tribute to the top 10 CNN Heroes of 2008.

Liz McCartney, dedicated to helping survivors of Hurricane Katrina rebuild their homes, has been named the 2008 CNN Hero of the Year.

McCartney, of St. Bernard Parish, Louisiana, received the honor at Saturday night's taping of "CNN Heroes: An All-Star Tribute." The telecast airs at 9 p.m. ET/PT on Thanksgiving on the global networks of CNN.

McCartney, who will receive $100,000 to continue her work just outside New Orleans, was selected from among the top 10 CNN Heroes after six weeks of online voting at CNN.com. More than 1 million votes were cast.

"To the country and the world, I ask you to please join us," McCartney said. "Together we can continue to rebuild families' homes and lives. ... If you join us, we'll be unstoppable."

Hosted by CNN's Anderson Cooper, "CNN Heroes: An All-Star Tribute" features moving musical performances by Aguilera, Keys and Legend. Watch a preview of the show, including Aguilera's performance "

Aguilera performed her hit single "Beautiful." Legend, backed by the world-renowned Agape Choir, brought the audience of more than 2,000 to their feet with his powerful call to personal action, "If You're Out There," from his just-released album, "Evolver." Keys sang "Superwoman," her tribute to women around the world, from her hit album "As I Am."

1. What is a hit of Christina Aguilera?
2. Where did she perform it?
3. What was the tribute for?
4. Who was one of the heroes?
5. What did she do?
6. "
7. Where is McCartney from?
8. Where is she working?
9. Was she given money to continue?
10. How much?
11. How many people voted for her?
12. How long was the voting period?
13. Who backed Aguilera during the show?
14. How many people were watching?
15. What did Keys sing?
16. What album is that from?
17. Was the song a tribute to something?
18. When did the show air?
19. Who is it hosted by?
20. What album is If You're Out There from?
1. Beautiful
2. CNN Heroes: An All-Star Tribute
3. pays tribute to the top 10 CNN Heroes of 2008
4. Liz McCartney
5. dedicated to helping survivors of Hurricane Katrina rebuild their homes
6. Singer Christina Aguilera joins fellow Grammy Award winners Alicia Keys and John Legend for "CNN Heroes: An All-Star Tribute," airing Thanksgiving night on CNN.
7. St. Bernard Parish
8. New Orleans
9. Yes
10. $100,000
11. More than 1 million votes were cast
12. six weeks
13. Agape Choir
14. 2,000
15. Superwoman
16. As I Am
17. to women around the world
18. Thanksgiving night
19. Anderson Cooper
20. Evolver