Write down thenumbers.[音频]1. __________2. __________3. __________4. __________5. __________[音频]Like many places, Macquarie Island has invasive species—species of nonnative plants and animals with no local natural controls on their populations. First came the cats, which were used on ships to control rats. Then came the rabbits, which were brought by seal hunters as a source of food. The hunters came because Macquarie Island is visited by around____6___elephant seals each year. No hunting is allowed now, however, because the island is a wildlife sanctuary.Macquarie Island has also been an accidental sanctuary for its invasive species. The rabbits found plenty to eat, and they ate an enormous amount of the island's plant life. In ___7___, scientists wanted to decrease the rabbit population, so the European rabbit flea (which carries a virus called myxomatosis) was introduced. By the 1980s, the rabbit population had declined from___8___to only___9___, and the vegetation on the island had begun to recover. But with fewer rabbits to eat, the cats began to prey on the island's sea birds, so scientists decided to kill the island's cats.Problem solved? Unfortunately, the virus had only reduced the rabbit population, and with the cats gone, the rabbits' numbers increased again. Now that so much of the island's vegetation is gone, there have been landslides after heavy rains. One expert estimates that it will cost$___10___to finally solve the invasive species problem on Macquarie Island.