In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

[Q]: Article: There have been many great inventions that changed the way we live.The first great invention was one that is still very important today--the wheel.This made it easier to carry heavy things and to travel long distances.For hundreds of years after that there were few inventions that had as much effect as the wheel.Then in the early 1800's the world started to change.There was little unknown land left in the world.People did not have to explore much anymore.They began to work instead to make life better.In the second half of the 19th century many great inventions were made.Among them were the camera, the electric light and the radio.These all became a big part of our life today. The first part of the 20th century saw more great inventions.The helicopter in 1909.Movies with sound in 1926.The computer in 1928.And jet planes in 1930.This was also a time when a new material was first made.Nylon came out in 1935.It changed the kind of clothes people wear.The middle part of the 20th century brought new ways to help people get over disease. _ worked very well.They made people healthier and let them live longer lives.By the 1960's most people could expect to live to be at least 60.By this time most people had a very good life. Of course new inventions continued to be made.But man now had a desire to explore again.The world was known to man but the stars were not.Man began looking for ways to go into space.Russia made the first step.Then the United States took a step.Since then other countries, including China and Japan, have made their steps into space.In 1969 man took his biggest step away from the earth.Americans first walked on the moon.This is certainly just a beginning though. New inventions will someday allow us to do things we have never yet dreamed of.
Answer: 1850
[A]: Camera was invented after _ .

[Q]: Article: In Vietnam, two members of a family of street vendors are finding a way to help the poorest students in Hanoi. Pham Minh Dap and his brother are providing the students with mostly free English and Japanese lessons at a learning center they created. The men want to help people who would not normally have a chance to learn a foreign language. Some education experts in Vietnam say such knowledge may help college graduates get jobs. The country's economy has improved. But many graduates continue to have a hard time finding employment. Local media reported ten percent of university graduates do not have a job. Earlier this year, 24-year-old Pham Minh Dap and his brother established a school they call "Stand By You". Volunteers teach poor students English and Japanese. Many classes are free. Students with some language knowledge pay 25 to 50 cents per class. Mr. Dap pays about $ 500 to rent the language center space and for other costs. He gives about $ 150 from his earnings as a street Vendor and private language teaching. His brother gives the same amount from the money he earns as a secretary. Friends provide the rest. Mr. Dap and many of his family members have sold things outside HoaBinh Park in the center of Vietnam's capital for five years. They come from a village of rice farmers in Thanh Hoa Province. Twenty-four-year-old Pham THi Trang is one of 600 students at the language school. She is finishing her university studies. Her parents work in a market in a village in Ha Nam Province. She says life is hard in the city. She earns about $50 a month from a part-time job, and her parents give her $ 75. But this is not enough to live on. She has said she has to be very careful with money so she can pay her bills. Demand for the school is growing. About 1,000 people are on a waiting list to enter. Ten people have offered to teach for free. And Mr. Dap says he is hoping to raise money to pay for a bigger place. He wants to open more classes.
Answer: by two brothers
[A]: "Stand By You" is established _ .

[Q]: Article: The pen is more powerful than the sword. There have been many writers who use their pens to write things that were wrong. Mrs. Harriet Beecher Stowe was one of them. She was born in the U. S. A. in 1811. One of her books not only made her famous but has been described as one that excited the world, and was helpful in causing a civil war and freeing the enslaved race. The civil war was the American Civil War of 1861, in which the Northern States fought the Southern States and finally won. This book that shook the world was called Uncle Tom's Cabin. There was a time when every English-speaking man, woman, and child had read this novel that did so much to stop slavery. Not many people read it today, but it is still very interesting, if only to show how a warm-hearted writer can arouse people's sympathies. The author herself had neither been to the Southern States nor seen a slave. The Southern Americans were very angry at the book, which they said did not at all represent the true state of affairs, but the Northern Americans were widely excited over it, and were so inspired by it that they were ready to go to war to set the slaves free.
Answer: one of her books
[A]:
Mrs. Harriet Beecher Stowe became famous for _ .