input: Make use of the article to answer the questions. Chinese player Li Na, a two-time Grand Slam champion, announced her retirement on Sept 21 because of long-term knee injuries. Although it was a hard decision, Li said she had no regrets . "I don't feel sorry about retiring, because I've tried my best," said the 32-year-old. Becoming professional at the age of 17, Li has set many milestones for Chinese tennis. She was the first Chinese player to win a WTA title and the first to break into the top 20. Li won the 2011 French Open title and became the first Asian player to ever win a Slam. By winning this year's Australian Open, she became the first Asian player with two Slams. As excellent as her tennis abilities are, Li's sense of humor is _ too. She often jokes about life with her husband in interviews, changing them into funny comedy shows. Her speech at the Australia Open in January is just the best example. During her 15-year professional career, Li has helped the improvement of tennis in China. Earlier this month, Chinese another player Peng Shuai, 28, made the semifinals of the US Open. Last week, a new tennis match started in Li's hometown of Wuhan. "I've seen changes happening in front of my eyes, young girls picking up tennis rackets, setting goals ... and believing in themselves," Li said in an online post. Li is more than a sports superstar. As WTA chief executive Stacey Allaster said, she is "a pioneer who opened doors to tennis for hundreds of millions of people throughout China and Asia." Li said she planned to take care of my family and then to open a tennis school in China after her retirement. Her official retirement ceremony will be on Sept 30. 1. How old is Li Na?
2. where is her home town?
3. when did she announce her retirement?
4. when is her official retirement ceremony?
5. what caused her to retire?
6. was it an easy decision?
7. does she regret it?
8. what did she win in 2011?
9. who does she joke with?
10. where has she helped improve tennis?
11. who is the other Chinese player who made the semifinals of the US Open?
numbered_answers: 1. 32
2. Wuhan
3. Sept 21
4. Sept 30
5. knee injuries
6. hard
7. no
8. French Open
9. husband
10. China
11. Peng Shuai

input: Make use of the article to answer the questions. (CNN) -- Elite sprinters Tyson Gay and Asafa Powell tested positive for banned substances on a day of shame for athletics.

Gay, a former world champion from the U.S., said Sunday he was told by the U.S. Anti-Doping Agency that an A sample from an out of competition test taken in May came back positive.

Later Sunday, Powell, a former world-record holder from Jamaica, said he was caught for using the banned stimulant oxilofrine that showed up in a test at last month's Jamaican trials.

Jamaica's Sherone Simpson, too, revealed she was caught for doping.

Gay didn't name the substance found in his system and added that he never knowingly took performance-enhancing drugs. He pulled out of next month's world championships in Russia.

"I don't have a sabotage story," Gay was quoted as saying by Reuters. "I basically put my trust in someone and was let down. I made a mistake.

"I know exactly what went on, but I can't discuss it right now."

Gay and Powell, both 30, become the second and third high-profile track stars in a month to be embroiled in a doping scandal.

Two-time Olympic 200-meter champion Veronica Campbell-Brown was provisionally suspended in June after she tested positive for a banned substance.

The Jamaican sprinter reportedly had traces of a banned diuretic, which is used as a masking agent, in a sample she provided to testers at Jamaica's International Invitational World Challenge in May.

British newspaper The Guardian reported the banned diuretic was from a cream she was using in an attempt to recover from a leg injury. 1. Who was suspended in June?
2. For what?
3. Where is she from?
4. Is she a champion?
5. Of what game?
6. For which event?
7. Did she only win once?
8. How many time?
9. What kind of substance showed up in her test?
10. Where did it come from?
11. When?
12. What was she getting over?
13. Was she using a cream?
14. What was in it?
15. Did Asafa Powell fail her test?
16. What did they find in her test?
17. Where is she from?
18. Did Tyson Gay pass his?
19. Was he sabotaged?
20. What was Sherone Simpson found to be doing?
numbered_answers: 1. Veronica Campbell-Brown
2. Testing positive for a banned substance
3. Jamaica
4. Yes
5. Olympic Sprinting
6. 200-meter
7. No
8. Two
9. Diuretic
10. A sampl provided to testers
11. May
12. Leg injury
13. Reportedly, yes
14. The diuretic
15. Yes
16. Oxilofrine
17. Jamaica
18. No
19. No
20. Doping

input: Make use of the article to answer the questions. (CNN) -- Educators and policymakers have long dreamed of providing universal, low cost, first-class higher education. Their wish may come true soon thanks to an unlikely source: Silicon Valley.

The mecca of the technology universe is in the process of revolutionizing higher education in a way that educators, colleges and universities cannot, or will not.

One of the men responsible for what may be an Athens-like renaissance is Sebastian Thrun, Google's vice president and pioneer in artificial intelligence and robotics. Known in science circles for his engineering feats -- like Stanley, the self-driving car -- Thrun is using his technological prowess to make quality higher education available to the world. I recently interviewed him on my radio show, "Morning In America."

Last year, while teaching a graduate level artificial intelligence class at Stanford University, Thrun lamented that his course could only reach 200 students in the suburbs of Palo Alto. So, he decided to offer his own free online class, with the same homework, quizzes and tests that he gives to Stanford students.

He announced the proposal with a single e-mail. Before he knew it, he had a flood of takers. "Usually I reach about 200 students and now I reach 160,000," said Thrun incredulously. "In my entire life of education I didn't have as much an impact on people as I had in these two months."

By utilizing online videos and educational resources, Thrun's class was being accessed by students from all corners of the world. In fact, the students themselves translated the class for free from English into 44 languages. 1. What location did the innovation in the article come from?
2. And what field is the innovation in?
3. Who was interviewed by the writer?
4. What's his job?
5. Is he famous for anything else?
6. Like what?
7. What is Stanley?
8. What show was the interview on?
9. Is that a TV show?
10. What kind then?
11. Where does Thrun teach?
12. What is his course about?
13. Is it for undergraduates?
14. How many students at the university could take the course?
15. Where is the university located?
16. What did Thrun do to change the situation?
17. How many students can take it now?
18. How did the tell people about the idea?
19. How long has he been giving the course online?
20. How many languages could students take the course in?
numbered_answers:
1. Silicon Valley
2. education
3. Sebastian Thurn
4. Google's vice president
5. yes
6. Stanley
7. a self-driving ca
8. Morning In America
9. no
10. a radio show
11. Stanford University
12. artificial intelligence
13. no
14. 200
15. Palo Alto
16. decided to give online class
17. 160,000
18. e-mail
19. unknown
20. 45