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David Ho is one of the most famous scientists in the world because of his research(研究) on 1. AIDS.
He was born in 1952 in Taiwan, China. He was 2. He Dayi. Dayi means "Great One" in Chinese. His family moved to the United States when he was 12 years old.
David was a smart student and he first studied 3. . He quickly realized that he was interested in life science, so he went to Harward Medical School. It was there that he saw people with AIDS. In the early 1980s, AIDS was almost unknown and Ho made up his 4. to study this mysterious(难解的) killer disease.
Ho discovered that the HIV virus(病毒) could survive in a 5. person's body for years. He said, "The earlier a person with HIV is 6. , the longer he will live."
His work is very important. With the help of his research, combinations of drugs(合成药) have been developed and the 7. of thousands of people have been saved. The whole world is grateful to him. 8. of his work, he was named "Man of the Year" in 1996 by Time.
In 9. years, he has been doing research on making a vaccine(疫苗) against AIDS. If Ho's research can be a 10. , he will become an international hero.

1. fighting 2. named 3. Physics 4. mind 5. healthy 6. treated 7. lives 8. Because 9. recent 10. success

In a primary school, Guadalupe Quintanilla was often considered as a "slow learner" 1. her teachers. But she really wasn't slow at 2. . She just didn't understand the language used in the classroom. Her 3. was that she didn't speak English. So she left school 4. the fourth grade.
When Guadalupe grew up, married, and had 5. of her own, she knew that her children were clever. But some of their teachers didn't think 6. . The children were having 7. in school because they didn't speak English. Mrs Quintanilla was angry. She didn't want people to think that her children were slow 8. . So she decided to learn English herself as a way of helping them. She practised English. She looked up words in the 9. . She asked the school headmaster to let her sit in classes. It wasn't easy, but she passed all her exams. She said that many of the other students helped her.
Mrs Quintanilla has helped her children with their lessons. Her two sons have won 10. . One is a teacher, and the other is a doctor. Her youngest child, a daughter, is studying in a university.

1. by 2. all 3. problem 4. after 5. children 6. so 7. trouble 8. learners 9. dictionary 10. success