The Australian government has built the longest fence(篱笆)in the world.It’s 9 500 kilometres long, and two 1 men 2 it.They drive along it and 3 it every day.If they do not, the dingoes(野狗)will 4 .Dingoes are wild dogs.One can easily 5 100 sheep in a day, or a flock of sheep in a few days.Dingoes killed 600 000 sheep in Queen land in 11 years.Those sheep were worth £ 2 000 000.The farmers were 6 , but they could not stop them.The problem was 7 big to the farmer to settle.So the government agreed 8 the fence.WhOy?Because Australia depends 9 her sheep.She exports(出口)percent of 10 the wool in the world.She must beat the fight against the dingoes.