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: The old lady was glad to be back at the block of flats where she lived. Her shopping had tired her and the basket had grown heavier with every step of the way home. In the lift her thoughts were on lunch and a good rest, but when she got out at her own floor, both were forgotten in her sudden discovery that her front door was open. She was thinking that she must tell her daily maid the next morning to lock the door, and then she remembered that she had gone shopping after the maid had left and she knew that she had turned both keys in their locks. She walked slowly into the hall and at once noticed that all the room doors were open, yet following her regular practice she had shut them before going out. Looking into the living room she saw a sight of confusion over by her writing desk. It was as clear as daylight then that burglars had forced into the house during her absence. Her first thought was to go round all the rooms looking for the thieves, but then she decided that at her age it might be more reasonable to have someone with her, so she went to fetch the doorman from his basement .By this time her legs were beginning to shake, so she sat down and accepted a cup of a very strong tea, while she telephoned to the police. Then her sense regained, she was ready to set off with the doorman's help to search for any thieves who might still be hiding in her flat.
Answer: her maid and child
[A]: When she saw the front door was open, the old lady forgot about _ .

[Q]: Article: In some parts of the United States, farming is easy. But farming has always been difficult in the northeastern corner of the country, which is called New England. New England has many trees and thin, rocky soil. Anyone who has wanted to start a new farm there has had to work very hard. The first job has been cutting down trees. The next job has been digging the stumps of the trees out of the soil. Then the farmer has had the difficult job of removing stones from his land. This work of removing stones never really ends, because every winter more stones appear. They come up through the thin soil from the rocks below. Farmers have to keep removing stones from the fields. Even today, farms which have been worked on for 200 years keep producing more stones. That is why stone walls are used instead of fences around New England fields. The stone walls are not high; a man can easily climb over them. But they keep the farmer's cows from joining his neighbor's cows.
Answer: why there are many stone walls in New England
[A]: This selection explains _ .

[Q]: Article: Accidents happen, but when they destroy the delicate balance of nature and cause the whole world to suffer, they become disasters, and we should do all we can to prevent them from happening again. Bhopal chemical leak, December 1984, Bhopal, India An explosion in the Union Carbide chemical plant in Bhopal, India, released a deadly gas called methyl isocyanate , which is used to make pesticides. The gas formed a cloud that killed 2500 people; another 50000- 100000 people became ill. Trees and plants in the area became yellow and brittle. The explosion was caused by a mechanical failure that was not noticed in time to stop it. Exxon Valdez oil spill, March 1989, Alaska, U.S. On March 24, 1989, 11 million gallons of crude oil spilled into Prince William Sound from the tanker Exxon Valdez when its hull hit a reef and tore open. The oil, which is not yet cleaned up after billions of dollars have been spent and the millions of birds, fish, and other wildlife have died, was caused by human error and could have been avoided. Chernobyl, April 1986, USSR At 1:23 A.M. on Saturday, April 26, 1986, the reactor blew at nuclear power plant in Chernobyl, ripping open the core, blowing the roof off the building, starting more than 30 fires, and allowing radioactive material to leak into the air. Some 31 people were killed and 200 people were treated for radiation poisoning. Still at risk are 135000 people from the 179 villages within 20 miles, of the plant who were exposed to the radiation before being evacuated. Glaring violations of safety rules were at the bottom of this tragic event. Love Canal, 1953, New York, U.S. Love Canal, a small town in upstate New York near Niagara Falls, was destroyed by waste from chemical plants. Beginning in 1947, chemical companies could legally dump their waste products into the canal. The area developed a foul smell, trees lost their bark, and leaves fell throughout the year. A health survey found that the drinking water contained excessive levels of 82 industrial chemicals, 7 of which were thought to cause cancer. The people of Love Canal had an unusually high rate of cancer and birth defects. Eventually, many of the houses had to be abandoned. Today, the town has been partly cleaned up and some families have moved back to the area. Three Mile Island, 1979, Pennsylvania, U.S. On March 28, 1979, the worst accident in U.S. nuclear reactor history occurred at the Three Mile Island power station, near Harrisburg, Pennsylvania. No one was killed, and very little radioactivity was released into the air when coolant (the fluid that keeps a machine cool) escaped from the reactor core due to a combination of mechanical failure and human error. After 10 years and $ 1 billion in cleanup costs, the lower extremes of the reactor are still so radioactive that workers must use remote - control equipment to remove the remaining fragment of fuel core.
Answer: accidents that affected many living things
[A]:
This passage mainly discusses _ .