Overhead bridges are found in many parts of big cities, especially in place{#blank#}1{#/blank#} traffic is very heavy and crossing the road is dangerous. The purpose of these bridges{#blank#}2{#/blank#}(be) to enable pedestrians to cross roads{#blank#}3{#/blank#}(safe). Overhead bridges are used in very much the {#blank#}4{#/blank#}way as Zebra crossings. They are more efficient although{#blank#}5{#/blank#}little) convenient because people have to climb up a long flight of steps. This is{#blank#}6{#/blank#}(convenient) especially to older people. When pedestrians use an overhead bridge, they do not hold up traffic. However, when they cross a busy road using a zebra crossing, traffic is held up. This is why the government has built many overhead bridges{#blank#}7{#/blank#}(help) pedestrians and to keep traffic moving at the same time. For their own safety, pedestrians should be encouraged to use them instead of {#blank#}8{#/blank#}(risk) their lives by dashing across the road. Old people, however, may find it a little difficult climbing up and down the steps, but it is still much safer than walking across the road with all the danger of moving traffic. Overhead bridges serve a very useful purpose. Pedestrians, both old and young, should make{#blank#}9{#/blank#}a habit to use them. This will prevent unnecessary accidents and {#blank#}10{#/blank#}(lose) of life.

    On May 18, it was announced that China had achieved success in drilling fire ice, a frozen {#blank#}1{#/blank#}(mix) of water and natural gas, from the South China Sea. {#blank#}2{#/blank#}(official) known as methane hydrates(甲烷水合物), fire ice produces a high amount of energy when {#blank#}3{#/blank#}(burn) and its chemical reaction produces nothing but dioxide and water.

    Fire ice, both clean and energy-intensive, {#blank#}4{#/blank#}(consider) the fuel of the future. Many countries, including the United States and Japan, have long been conducting research on fire ice, but extracting（提取）it from the bottom of the sea has been a common problem {#blank#}5{#/blank#}(trouble) all of them. But, the Chinese team succeeded in drilling fire ice for nearly eight successive days, {#blank#}6{#/blank#}is a big breakthrough.

    However, it is too early {#blank#}7{#/blank#}(say) a new energy source has been found. The world's total fire ice reserve is about 21,000 trillion cubic meters, which, if extracted, could meet the world's energy need

    {#blank#}8{#/blank#}1,000 years. But the successful test drilling of fire ice does not mean it can be extracted for {#blank#}9{#/blank#}(industry) use. China has to solve many problems before it can use fire ice as a source of energy.

    It's thought that only by 2025 at{#blank#}10{#/blank#} earliest might people be able to look at realistic commercial options.

Gary: Are you busy tomorrow night? I'm going over to the Workers Club for volleyball, would you like {#blank#}1{#/blank#} (come) along?

Maisie: Isn't that far away?

Gary: Not really. If you take {#blank#}2{#/blank#} No. 3 bus, you can get there in fifteen minutes. And if volleyball doesn't interest you, they've got a huge indoor swimming pool, a weights room, {#blank#}3{#/blank#} indoor tracks. It's a great place to meet people.

Maisie: Now that you mention it, {#blank#}4{#/blank#} would be nice to get away from the computer center for a change, and I really should get some more exercise. {#blank#}5{#/blank#} (work) up a sweat in a ball game or the weights room would be nice. I've got much {#blank#}6{#/blank#} (fat).

Gary: Look at me {#blank#}7{#/blank#} then you know you're not the only one. In high school I had a lot more time to do sports. Now whatever little spare time you have must {#blank#}8{#/blank#} (use) in doing exercise. At least the club is open {#blank#}9{#/blank#} 12 p. m.

Maisie：I guess it's worth a visit. Did you say you're going tomorrow night?

Gary：Yeah.

Maisie: OK, I will come, too. How about meeting me in {#blank#}10{#/blank#} of the cinema at eight, and we'll catch the bus there.

Gary: Sure, see you then.

    The British have been drinking tea for over 350 years. But in fact, the history of tea goes much {#blank#}1{#/blank#}(far) back.

    The story of tea begins in China. According to the legend, the Chinese emperor Shen Nung was sitting {#blank#}2{#/blank#}a tree while his servant boiled drinking water, when some leaves from the tree blew into the water. Shen Nung,{#blank#}3{#/blank#} expert in herbal medicine, decided to try the water his servant created. As a result, it tasted so good that later the drink was{#blank#}4{#/blank#} we now call tea.

    It is{#blank#}5{#/blank#}(possible) to know whether there is any truth in this story. {#blank#}6{#/blank#}, tea drinking certainly was established in China many centuries before it had even been heard of in the west. Containers of tea {#blank#}7{#/blank#}(find) in tombs dating from the Han dynasty (206BC-220AD) before tea was firmly established as the national drink of China in the Tang dynasty (618-906AD). It became {#blank#}8{#/blank#} a favorite thing that during the late eighth century, a writer {#blank#}9{#/blank#}(call) Lu Yu wrote the first book entirely about tea, the Ch'a Ching, or Tea Classic. It was shortly after this that tea was first introduced to Japan, by Japanese Buddhist monks who had travelled to China to study before. Tea drinking has become a vital part of Japanese culture,{#blank#}10{#/blank#}may be rooted in the sprit described in the Ch'a Ching.

    Many of the earth's plants and animals have already{#blank#}1{#/blank#}(die) out, and a hundred species become {#blank#}2{#/blank#}(endanger) every day. If nothing is done, we may find ourselves{#blank#}3{#/blank#} (lonely) on the earth.

    Wild animals live in the{#blank#}4{#/blank#} (forest) which are being destroyed by people. As{#blank#}5{#/blank#} result, the animals are {#blank#}6{#/blank#}(lose) their habitats. Without the trees, the animals are short of food. And many animals are dying out because of pollution.

    I suggest that measures should be taken {#blank#}7{#/blank#}(protect) wildlife. The government should keep people {#blank#}8{#/blank#}destroying forests and shut down the factories {#blank#}9{#/blank#} pollute rivers and air, I think more wildlife reserves should also be {#blank#}10{#/blank#}(build).