Are you facing a situation that looks impossible to fix?

    In 1969, the pollution was terrible along the Cuyahoga River Cleveland, Ohio. It {#blank#}1{#/blank#} (be) unimaginable that it could ever be cleaned up. The river was so polluted that it {#blank#}2{#/blank#} (actual) caught fire and burned. Now, years later, this river is one of {#blank#}3{#/blank#} most outstanding examples of environmental cleanup.

    But the river wasn't changed in a few days {#blank#}4{#/blank#} even a few months. It took years of work {#blank#}5{#/blank#} (reduce) the industrial pollution and clean the water. Finally, that hard work paid off and now the water in the river is {#blank#}6{#/blank#} (clean) than ever.

    Maybe you are facing an impossible situation. Maybe you leave a habit {#blank#}7{#/blank#} is driving your family crazy. Possibly you drink too much or don't know how to control your credit card use. When you face such an impossible situation, don't you want a quick fix and something to change immediately?

    While there are {#blank#}8{#/blank#} (amaze) stories of instant transformation, for most of us the {#blank#}9{#/blank#} (change) are gradual and require a lot of effort and work, like cleaning up a polluted river. Just be {#blank#}10{#/blank#} (patience)

    Dogs were first raised at home at least 150 centuries ago. Since then, the dog {#blank#}1{#/blank#} (be) humans' best friend. Now, they have another job—to assist doctors to diagnose（诊断）cancer.

    After a long-standing research of smell, a Finnish professor has said that certain {#blank#}2{#/blank#} (type) of cancer are able to be detected by their smell, making it possible to train cancer-sniffing dogs {#blank#}3{#/blank#} (help) diagnose the disease.

    A professor, Jouko Vepsalainen from the University of Eastern Finland in Kuopio, has focused {#blank#}4{#/blank#} nitrogen compounds（氮化合物）. The compounds increase {#blank#}5{#/blank#} (great) when cancer cells grow in an uncontrollable way, {#blank#}6{#/blank#} (allow) them to be detected, the Finnish newspaper Karjalainen reported. That's where the dog, man's best friend, may step in with their keen sense of smell.

    According to the news agency, researchers in Finland have tried to train dogs to do the job, but {#blank#}7{#/blank#} will take a dog months, even years, to tell the {#blank#}8{#/blank#} (different) between sick and healthy people. “Anyone {#blank#}9{#/blank#} knows how difficult early cancer detection is {#blank#}10{#/blank#} (understand) what an opportunity this is,” associate professor Anna Hielm-Bjorkman of the University of Helsinki told the Finnish media.

    You see them everywhere: people walking with their attention {#blank#}1{#/blank#}（concentrate）on their smartphone screens on busy streets. But walking and texting can be dangerous and cities in the United States and Europe have stepped {#blank#}2{#/blank#} their efforts to deal with it.

    In Honolulu, using the phones while crossing the street is forbidden. It has passed a law that says “No pedestrian （行人） shall cross a street or highway while viewing a mobile electronic device. In other words, do not look at a screen when you cross the street{#blank#}3{#/blank#} you could be fined. Honolulu is the first major U.S. city{#blank#}4{#/blank#} （forbid）what is called “distracted walking”.

    People {#blank#}5{#/blank#} text while walking are nearly four times as likely to have at least one dangerous action. A lot of people do it {#blank#}6{#/blank#} they know it is dangerous. They tell themselves that it is important.

    Using phones while walking may lead to injuries and deaths, but it seems to be a global problem. Pedestrian deaths {#blank#}7{#/blank#}（increase）as the use of cell phones rises in the past 5 years, and it is expected that the tendency will continue.

    Other cities have come up with creative ways to help protect those using cellphones while walking. A small town near Amsterdam has set up special crosswalks with flashing lights on the ground. When the traffic lights turn red or green,{#blank#}8{#/blank#} do the lights on the ground, reminding pedestrians when it's safe to cross. In a town of Germany, similar lights were used after a teenager using her smart phone was hit and seriously{#blank#}9{#/blank#}（injure）.

    If you still want to text while walking you could avoid being fined in Honolulu {#blank#}10{#/blank#}using voice-controlled digital assistant（数字助手） like Siri or Google Assistant Or you could just wait until you are again, safely off the street.