Read the text and answer the questions.

(CNN) -- When Barack Obama was elected U.S. president he probably did not realize it would give him a chance to pick up tips on his backswing from the world's elite golfers.

U.S. President Barack Obama and Vice President Joe Biden make use of the White House putting green.

Obama is the honorary chairman for the 2009 Presidents Cup which will be contested at Harding Park Golf Course in San Francisco this week where the top U.S. golfers take on the best players from around the world outside of Europe.

As a golf enthusiast, and keen amateur player, the president will get the chance to pick the brains of Tiger Woods, Phil Mickelson, Ernie Els and Vijay Singh on how to improve his game.

But he is not the first to take to the greens while occupying the Oval Office with 15 of the last 18 U.S. presidents said to have played the sport while in power. Living Golf's gallery of presidential putters. "

Dwight Eisenhower is recognized as probably the most dedicated to the sport, and was often criticized by Democrats for spending too much time on the golf course.

Eisenhower's solution? In 1954 he had a putting green installed at the White House a short stroll from the Oval Office to enable him to practice while at work which was regularly used by subsequent presidents and still exists to this day.

The former five-star general was also a member at the Augusta National Golf Club where a overhanging tree on the 17th hole proved such an obstacle to the leader that it was dubbed the "Eisenhower Tree."

1. What does Obama and Biden use at the White House?
2. What is he doing this week?
3. Where is it?
4. Which course?
5. While there what will he have a chance to do?
6. Who can help him?
7. Is he the first to play?
8. How many have enjoyed the game?
9. Who was the most enthusiastic?
10. What was he criticized for?
11. By whom?
12. What did he do?
13. Where else did he play?
14. Where was a problem?
15. What was it?
16. What did they call it?
17. What was he before he became president?
18. Who else will Obama be able to ask questions of?
19. Will anyone from Europe be there?
20. Will there be anyone from outside the US?

Numbered answers:
1. putting green
2. Obama is the honorary chairman for the 2009 Presidents Cup
3. San Francisco
4. Harding Park Golf Course
5. improve his game
6. Tiger Woods
7. No
8. 15 of the last 18 U.S. presidents
9. Dwight Eisenhower
10. spending too much time on the golf course
11. Democrats
12. putting green installed at the White House
13. Augusta National Golf Club
14. 17th hole
15. a overhanging tree
16. "Eisenhower Tree."
17. five-star general
18. Phil Mickelson
19. No
20. Yes