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

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

    The polar bears' world is melting. Studies show that the amount of the polar ice {#blank#}4{#/blank#}（have）decreased by 9.8% every 10 years since 1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears rely {#blank#}5{#/blank#} the sea ice for their survival. “The sea ice is more {#blank#}6{#/blank#} 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. But in a warmer world, these cycles speed up, and bears have less time {#blank#}9{#/blank#} (hunt). Normally, they have three months in the spring when they gain more weight. The extra fat is used later, when the bears are not {#blank#}10{#/blank#}(active) hunting.

    Glasgow is situated in southwest Scotland along both banks of the River Clyde and has{#blank#}1{#/blank#}population of over 590,000 people. It is the largest city in Scotland,{#blank#}2{#/blank#} has successful business, finance, tourism, call centre, and an excellent harbour as well.

    Glasgow is an{#blank#}3{#/blank#}(attract) city in Europe. It has world-famous art{#blank#}4{#/blank#}(collect), the best shopping in the United Kingdom outside London, and the most{#blank#}5{#/blank#} (enjoy) nightlife in Scotland. A must-see is the works of Scotland's best-known architect Charles Rennie Mackintosh, the unique style of whom {#blank#}6{#/blank#}(decorate) attractions such as the Lighthouse, Glasgow School of Art and House for an Art Lover.

    Art and culture are so important in Glasgow life {#blank#}7{#/blank#}galleries and museums are great in number. There's a choice of over 20{#blank#}8{#/blank#}(include) the world's first Museum of Religion and the outstanding McLellan Galleries.{#blank#}9{#/blank#}their credit, the Scots value traditional art and culture in Glasgow and have them well {#blank#}10{#/blank#}(preserve) through long time.

    A sand storm often takes place in the northern China, {#blank#}1{#/blank#} is a kind of natural disasters. China usually experiences this kind of weather between February and May, while March and April see the most frequent and the {#blank#}2{#/blank#} (strong) sand storms. It becomes a very important environmental problem. It does damage {#blank#}3{#/blank#} the society as well as the environment. Firstly, the strong wind destroys soil and plant cover by {#blank#}4{#/blank#} (bury) fields with sand and dust. Secondly, by leaving too much dust in the air it will {#blank#}5{#/blank#}(serious) pollute the air. Thirdly, a sand storm will have {#blank#}6{#/blank#}bad effect on transportation. The dust in the air makes traffic and aircraft movements more difficult. And when the sand buries the roads, the traffic will{#blank#}7{#/blank#}(block). When plants in the farmland are buried, food supply will lose.

    Sand storms are another {#blank#}8{#/blank#}(punish) nature gives to mankind. We should not only take effective measures {#blank#}9{#/blank#}(stop) them, but also draw some {#blank#}10{#/blank#}(lesson) from them. We should not develop the economy (经济) at the cost of the natural environment.