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.

    It is not a secret {#blank#}1{#/blank#} trees are vital to our life. They provide us with food, wood and most {#blank#}2{#/blank#} (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.

    The discovery {#blank#}3{#/blank#} (make) by a team {#blank#}4{#/blank#} (consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students {#blank#}5{#/blank#} were seeking a natural water filter(过滤)—one that would help communities in developing countries that do not have {#blank#}6{#/blank#} (accessible) to modern water filter systems.

    The {#blank#}7{#/blank#} (research), led by Professor Rohit Karnik, decided to turn{#blank#}8{#/blank#} trees for help, because they could allow liquid to flow through, while blocking out air bubbles.

    They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood's filtering ability by pouring water containing red dye particles of different sizes through. To their {#blank#}9{#/blank#} (amaze), they found that it was effective in trapping all the particles. Greatly {#blank#}10{#/blank#} (encourage), the team conducted another experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

    Here is a message that needs to {#blank#}1{#/blank#}(keep) in mind by every mom and dad. You love your kids not because of{#blank#}2{#/blank#}they do, but because of who they are.

    In fact, raising a child is just like training a dog. You reward your children because of their

    {#blank#}3{#/blank#} (succeed) or progress they made.{#blank#}4{#/blank#} (similar), a circus trainer gives a dog some food every time it {#blank#}5{#/blank#}(jump) through a hoop (圈).

The dog isn't loved for itself,{#blank#}6{#/blank#} for its actions.

    Dr. Laura Schlessinger, the popular talk show host, has a new book for children{#blank#}7{#/blank#} (title) Why Do You Love Me? Part of the story includes a mother {#blank#}8{#/blank#} (explain) to her son that it is not what he does that makes her love him—she loves him because he is unique and he is {#blank#}9{#/blank#} (she) son.

    Every mom, dad and grandparent needs to memorize the words of {#blank#}10{#/blank#}popular song: I love you most of all because you are you.

    How long have you not written a character?

    Popular TV program National Chinese Characters Contest has brought people's attention back to written Chinese.

    The{#blank#}1{#/blank#}(compete)is the Chinese version of a classic word game American Spelling Bee. Pupils{#blank#}2{#/blank#}usually come from the fifth or sixth grade,{#blank#}3{#/blank#} (divide)into different teams and try to write down every word according to Its pronunciation.

    In less than two hours, the contestants need to solve dozens of questions{#blank#}4{#/blank#}(concern) error- prone(容易出错的) characters. Many students keep up with the show. They refer to{#blank#}5{#/blank#}as “the interesting Chinese lessons on TV”. Teachers and parents are also happy to see that children can learn and have fun at the same time.

    The program has gone beyond the circle of primary school students. “It is {#blank#}6{#/blank#}(surprising) instructive. I have corrected a lot of my own mistakes by watching the show,” said{#blank#}7{#/blank#}adult viewer.

    Guan Zhengwen, chief director of the show, considers written Chinese{#blank#}8{#/blank#}the root of China‘s{#blank#}9{#/blank#}(culture)heritage, “TV shows on Chinese language mean more than just a trend,” he said. “Mass media need to seek innovation(创新) in order to preserve our culture, We hope that National Chinese Characters Contest will get more people{#blank#}10{#/blank#}(brush)up our written language.”

    All China's major cities have good transport{#blank#}1{#/blank#}(network). There are the tour buses, mini buses, taxis, as well as public buses,

    Buses in Chinese towns are always{#blank#}2{#/blank#}(crowd). The fare depends on distance, and is payable to the{#blank#}3{#/blank#}(conduct) of buses.

    A taxi is often {#blank#}4{#/blank#}most convenient means of travel in the City. They are available at airports, railway stations and hotels and even in urban areas. The total fare depends on the starting meter price{#blank#}5{#/blank#}can range from 5 to 12 yuan, and the distance. Extra fees{#blank#}6{#/blank#}(charge) for waiting and low speed driving during traffic jams. If you take a taxi after 11 pm, a 20 percent surcharge applies over the basic fare.

    The minibus is a compromise between the{#blank#}7{#/blank#} (relative) expensive taxis and full public transport. Their charge is a little more than that of the bus, about 2 yuan or more{#blank#}8{#/blank#} (depend) on distance, but it is very convenient, because it can stop{#blank#}9{#/blank#} any point you want along the route.

    Tour buses, normally {#blank#}10{#/blank#} (equip) with air conditioning and TV, are managed by travel agencies, hotels and airports and provided for short tours, A tour guide is usually present on such buses.

    Graffiti (涂鸦) and street art are forms of art created on walls or public surfaces. This art is often considered illegal because it is done without the {#blank#}1{#/blank#} (permit) of the building owners. These art forms {#blank#}2{#/blank#} (exist) since the times of ancient Greece. But the more modem style began forming in the 1960s in the cities of New York and Philadelphia. “Graffiti” often appears as words- {#blank#}3{#/blank#} (usual) the names of the artist or their art crew. Graffiti artists write the words in {#blank#}4{#/blank#} (create) ways and with colorful spray-paint.

    “Street art” is more based {#blank#}5{#/blank#}images. Artists try to communicate a message through these images. Graffiti and street art can be controversial. They sometimes damage someone's property. Washington has tried to increase its fines for illegal graffiti, {#blank#}6{#/blank#}, however, is encouraging the creation of public art. America's capital city is trying hard {#blank#}7{#/blank#} (control) its illegal graffiti problem. At the same time, city officials recognize the value and importune or street art. There is {#blank#}8{#/blank#} high demand for more artists to make street art legally. But the city offers few {#blank#}9{#/blank#} (chance) for young D.C. street artists to develop their skills without {#blank#}10{#/blank#} (break) the law.