instruction:
In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .
question:
Pilots have reported 167 cases of toxic cabin fumes or smoke in only four months, official safety figures reveal. Twelve of the cases resulted in the pilots requesting a priority landing, one flight was diverted and on two flights the pilots made an emergency Mayday call. Among the worst cases, one incident report in February noted: ‘Fumes in cabin. Eleven of the cabin crew became unwell during flight, with symptoms of light-headedness, nausea and “sea sickness”. Oxygen administered. Aircraft returned.’ Victim? It is suspected British Airways pilot Richard Westgate, who died in 2012, had Aerotoxic Syndrome The figures have re-opened the argument about whether prolonged exposure to the air in planes is safe for passengers and crew.Pilots reported 167 cases of toxic cabin fumes or smoke in four monthsTwelve cases led pilots to request priority landing, with Mayday call in twoReignited debate on whether prolonged exposure to air in planes is safeMany former pilots and aircrew think they've suffered long-term illnesses
answer:
The coroner’s intervention was the first official recognition of _, thought to be linked to memory loss, tremors, lethargy, headaches, tinnitus, confusion, breathing difficulties and even death.


question:
(CNN) By the thousands people are leaving their porch lights on -- in Minnesota and other parts of the country -- for the child who never came home. The lights are being left on through the holiday weekend in memory of Jacob Wetterling, a Minnesota boy who was abducted 27 years ago. Local authorities announced Saturday that his remains had been found. Jacob, who was 11, disappeared on a dark road in central Minnesota on the night of October 22, 1989. Since then, his whereabouts had been unknown. His mother, Patty Wetterling, became an advocate for families of missing children. The family described being in "deep grief. We didn't want Jacob's story to end this way."Supporters turn on outdoor lights in memory of Jacob WetterlingWetterling, 11, was abducted in 1989 on a rural Minnesota roadHis body was found after 27 years of mystery
answer:
Another person wrote: "_ loves you and your family," in a tweet addressed to Jacob's mother.


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Durban (CNN) A vaccine against HIV will be trialed in South Africa later this year after meeting the criteria needed to prove it could help fight the epidemic in Africa. In 2015, 2.1 million new infections were reported -- two-thirds of which occurred in sub-Saharan Africa. A small trial, known as HVTN100, took place in South Africa in 2015 to test the safety and strength of immunity the vaccine could provide, ahead of any larger-scale testing in affected populations. Two-hundred and fifty-two healthy volunteers were enrolled to receive either the vaccine, known as ALVAC-HIV/gp120, or a placebo to compare the extent of immune response generated. The results were presented Tuesday at the 21st International AIDS Conference in Durban, South Africa.A new form of HIV vaccine has proved safe enough for clinical trialsThe vaccine will be trialed in 5,400 people from November
answer:

The vaccine was improved for use in the higher-risk populations of sub-_, where a different subtype of the virus also exists.