—No, he {#blank#}1{#/blank#}（try）to, but failed.

    Each year thousands of{#blank#}1{#/blank#} (explore) and tourists visit the polar regions of the Arctic and Antarctica. But the increasing number of people travelling to the ends of the Earth' can have a negative effect{#blank#}2{#/blank#} fragile ecosystems. Should tourists{#blank#}3{#/blank#}(allow) to visit polar regions?

    About 40,000 tourists visit Antarctica each year, More than five million travel to the Arctic and sub-Arctic. Transporting tourists to the regions {#blank#}4{#/blank#}(increase) ship and airplane traffic, adding to the risk of pollution, oil spills, and other {#blank#}5{#/blank#}(environment) damage. Because the places where wildlife is accessible {#blank#}6{#/blank#}(be) few in numbers, tourist traffic can become concentrated in specific areas,{#blank#}7{#/blank#} (put) Arctic vegetation at risk.

    Others say that access{#blank#}8{#/blank#} these very special parts of the world should not be restricted to only researches and scientist. Polar tourism allows people to develop deep personal connections with polar regions. “Those {#blank#}9{#/blank#}travel to the Arctic or Antarctica often become cheer leaders for supporting those places” Jim Sano, vice president for travel and{#blank#}10{#/blank#}(conserve) at World Wildlife Fund, told TFK.

    Whether enveloped by the thick smog from factories or unseen poisons from vehicle waste gases, many cities around the world are losing the battle against air pollution．

    Somewhere, many people died from breathing in the smoke and harmful gases {#blank#}1{#/blank#} (pour) into the air．In China and India, the damage of this poisonous air is particularly alarming, {#blank#}2{#/blank#}(cause) three million deaths in those two countries．As a result, some out-of-breath citizens are turning to bottled air．

    Many companies are compressing fresh countryside air into bottles and {#blank#}3{#/blank#} (sell) it online．It sounds like a joke but the idea is to raise {#blank#}4{#/blank#}(aware) and it provided people {#blank#}5{#/blank#}fresh air at a price．One such company is Vitality, {#blank#}6{#/blank#} collects air from the Canadian Rockies and compresses it into container．Vitality started the business to sell the canned air as joke gifts at first．{#blank#}7{#/blank#} the products took off in a {#blank#}8{#/blank#} ( surprise) way then．So, the manager came up with the business idea {#blank#}9{#/blank#} they can sell fresh air over the world．The manager of the company  has  made {#blank#}10{#/blank#}clear that China, India and South Korea have become its main markets．

    The polar bear is found in the Arctic Circle and some big land masses as far south as Newfoundland. While they are rare north of 88°, there is evidence {#blank#}1{#/blank#} they range all the way across the Arctic, and as far south as James Bay in Canada. It is difficult to figure out a global population of polar bears as much of the range has been {#blank#}2{#/blank#} (poor) studied; however, biologists calculate that there are about 20,000-25,000 polar bears worldwide.

    Modern methods {#blank#}3{#/blank#} tracking polar bear populations have been employed only since the mid-1980s, and are expensive {#blank#}4{#/blank#} (perform) consistently over a large area. In recent years some Inuit people in Nunavut {#blank#}5{#/blank#} (report) increases in bear sightings around human settlements, leading to a {#blank#}6{#/blank#} (believe) that populations are increasing. Scientists have responded by {#blank#}7{#/blank#} (note) that hungry bears may be congregating (聚集) around human settlements, leading to the illusion (错觉) that populations are {#blank#}8{#/blank#} (high) than they actually are. Of {#blank#}9{#/blank#} nineteen recognized polar bear subpopulations, three are declining, six {#blank#}10{#/blank#} (be) stable, one is increasing, and nine lack enough data.

    Adam, a freshman of senior high school, thought going to senior high school was really {#blank#}1{#/blank#} (challenge). The first week made him a little {#blank#}2{#/blank#} (confuse). Different from junior middle school, he had to choose {#blank#}3{#/blank#} (suit) courses. He chose Chinese, hoping to speak it {#blank#}4{#/blank#} (fluent) when he graduated. His adviser also suggested that he sign {#blank#}5{#/blank#}  for advanced literature.

    Besides, he tried to join the football team, {#blank#}6{#/blank#} he failed. {#blank#}7{#/blank#} (obvious), he had to find a way to improve on his own to try next year. In a word, he wanted to be a person with a strong sense of {#blank#}8{#/blank#} (responsible). Though he was worried about {#blank#}9{#/blank#} (keep) up with other students, he was sure he {#blank#}10{#/blank#} (will) be well prepared for future life.