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:
Tons of rotting fish have filled a lagoon in Rio de Janeiro, Brazil where Olympic rowing and canoeing events will be held during next year's Games. Over the past week, thousands of the silver fish have died and have been scooped out of Rodrigo de Freitas lake, but city authorities and biologists have argued about the cause. More than 37 tons of fish have been collected, according to Rio's waste management company, but there is still an overwhelming stench, sparking complaints from neighbours and passers-by. Clearing: Rio's waste management company said it has cleared more than 37 tons of fish, which have been taken to the city's main dumpTons of dead fish are being cleared from a stinking lagoon in Rio de Janeiro, Brazil, which will host Olympic eventsRotting silver fish have filled Rodrigo de Freitas lake where rowing and canoeing events should take place next yearThere is an overwhelming stench and authorities and biologists have argued about about the cause of the deaths
answer:
The die-offs are common in _, where rivers, lakes and even the ocean are blighted by raw sewage and garbage.


question:
Tehran (CNN) -- Iranian TV aired images Thursday of what it says is a U.S. stealth drone that went down in Iran last week, an apparently intact RQ-170 drone propped on a pedestal and triumphantly displayed. "Military experts are well aware how precious the technological information of this drone is," said Brig. Gen. Amir Ali Hajizadeh, commander of the Islamic Revolutionary Guards Corps Aerospace Forces, according to the semi-official Fars News Agency. There was disagreement among Pentagon officials about whether the drone in the video is real. Military and intelligence officials were analyzing the Iran television footage. One U.S. official said right now the U.S. can't be certain it's the real stealth drone, because U.S. personnel don't have access to it. But he added there's no reason to think it's a fake.U.S. official: "We now have no reason to believe" the drone in the video is a fakeAnother official questions the intact appearance of the drone after a crashAn Iranian general says the drone was downed "with minimum damage"Iran's Foreign Ministry delivers a reprimand of U.S. to Swiss envoy
answer:
A _ satellite quickly pinpointed the downed drone, which apparently sustained significant damage, the senior official said.


question:
A mother and her four children are fighting for their lives after being mowed down by a car 'doing 100mph' as they strolled to the park. Five ambulances and an air ambulance rushed to Grove Lane in Handsworth, Birmingham, following the horrific collision at 12.05pm today. Paramedics found a woman in her 30s, a four-year-old boy, a seven-year-old girl, a 12-year-old girl and a 14-year-old boy had been hit by a grey Seat Leon. Witnesses said the two youngest children were sent flying '20 to 30 metres down the road' due to the force of the impact as the family crossed the road.Five ambulances and air ambulance rushed to collision at 12.05pm todayFound a woman in her 30s and four children had been hit by a Seat LeonWitnesses said two youngest children were sent '30 metres down the road'Police have arrested a 35-year-old man on suspicion of dangerous driving
answer:

Another witness, who was travelling on a bus on _ when the collision happened, said: 'I was at the front of the bus so got a clear view.