If the population of the Earth keeps on increasing at its present rate, there will eventually not be enough resources {#blank#}1{#/blank#} (leave) to support life on the planet. By the middle of the 26^th century, if present trends continue, we {#blank#}2{#/blank#}（use）up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on the earth will make{#blank#}3{#/blank#} necessary for us to look for open space somewhere else. But {#blank#}4{#/blank#} of the other planets in our solar system are capable of supporting life at present. One possible solution {#blank#}5{#/blank#} the problem, {#blank#}6{#/blank#}, has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes {#blank#}7{#/blank#} before the Earth's resources are {#blank#}8{#/blank#} (complete) exhausted it will be possible to change the atmosphere of Venus and therefore create a new world almost as large as the Earth {#blank#}9{#/blank#}.The difficulty is that Venus is much hotter than the Earth. {#blank#}10{#/blank#}, there is only a tiny amount of water there.

    Polar bears are suffering in a {#blank#}1{#/blank#} (warm) world.

    Polar bears live in environments too cold for most animals. {#blank#}2{#/blank#} much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared {#blank#}3{#/blank#} for the cold conditions. But nothing has prepared the bears for the danger that {#blank#}4{#/blank#} (threat)the only home they know.

    The polar bears' world is melting. Studies show that the polar ice has reduced by 9.8% every 10 years {#blank#}5{#/blank#} 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their {#blank#}6{#/blank#} (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher, {#blank#}7{#/blank#} scientist who studies North American polar bear populations. “{#blank#}8{#/blank#} it, they can't exist.”

    Some melting and refreezing of the polar ice is natural. {#blank#}9{#/blank#} in a warmer world, these cycles speed up, and bears have less time to hunt. Normally, they have three months in the spring when they gain more weight. The extra fat is used later, {#blank#}10{#/blank#} the bears are not actively hunting.

    The Isle of Man lies in the Irish Sea, between the north of England {#blank#}1{#/blank#} Ireland. It {#blank#}2{#/blank#} (become) separated from Britain and Ireland by 6500 BC. It is a{#blank#}3{#/blank#} (self-govern) dependency （属地） of Britain, and its parliament {#blank#}4{#/blank#} (date) back to Viking times over a thousand years village{#blank#}5{#/blank#}There are 22 local authorities on the Isle of Man, consisting {#blank#}6{#/blank#} 4 town, 2 district, 2 village and 14 parish authorities. However, the British government has final authority and the Queen is Head of State. The Isle of Man has{#blank#}7{#/blank#} own currency and a very low rate of tax, so it is popular with rich people and banks and financial businesses. Road-racing is very popular and attracts{#blank#}8{#/blank#} (thousand) of visitors, especially to the motorcycle races in May and June. A type of cat{#blank#}9{#/blank#} (find) on the island, called “Manx” cat, is famous for having no tail. The {#blank#}10{#/blank#} (office) symbol of the Isle of Man, used on the flag, is a circle with three legs attached.

    Some years ago, SARS broke out in the mainland of China, {#blank#}1{#/blank#} (cause) some people to be killed or nearly got to death. {#blank#}2{#/blank#} severe was the situation that there was no time to debate who was {#blank#}3{#/blank#} (blame). The most important thing for the government to do was find out the cause of this {#blank#}4{#/blank#} (dead) disease. They invited all the top experts in this field to have a discussion and quite a few {#blank#}5{#/blank#} (suggestion) were put forward. Some of the top experts picked out those suggestions and tested them to see whether they were available. Doctor Zhong Nanshan chose one patient {#blank#}6{#/blank#} was seriously ill and had little hope of picking up and had the new medicine {#blank#}7{#/blank#} (test) on him. To his great joy, this patient recovered! He made his way to his office and telephoned the top official, telling him the exciting news. For {#blank#}8{#/blank#} (convenient), he moved to live in his office. His method did make sense. {#blank#}9{#/blank#} wasn't long before the other hospitals also controlled this terrible disease and kicked it out finally. If no efforts {#blank#}10{#/blank#} (make), China couldn't have defeated SARS.