With global warming and melting ice, it isn't easy being a polar bear anymore. Some studies have predicted that polar bears could die out by the end of the century. The good news is not all researchers think the bears are absolutely disappearing. Scientists at the American Museum of Natural History(AMNH) have published a new paper indicating that things might not be as bad for polar bears as some scientists expect.

To understand the reason for the researchers' cautious optimism, we must first understand the factors that are threatening the polar bear's existence. Polar bears consume a diet of mainly young seals. In order to hunt these seals, polar bears need to rest at the top of sea ice—the same ice that is increasingly melting for most of the year thanks to climate change. In another 50 years, experts expect that the Arctic will be too warm for sea ice to form for half of the year, leaving polar bears without a reliable food source and in serious danger of starvation.

As it turns out, alternative food sources for the polar bears aren't completely out of the question. For as long as biologists have tailed after the animals, they've seen polar bears eating animals found on land like caribou(驯鹿) and snow geese—as well as the snow geese's eggs.

    Can polar bears actually survive off these alternative food sources for long periods of time? To figure this out, researchers calculated the nutrients that a caribou and snow geese diet would provide. They found that even adult male polar bears would be able to obtain more calories than would burn in hunting these meals. Moreover, the food would provide the food lecessary to avoid starvation during the summer months.

    Unfortunately, not all polar bears have tended to seek food on land. That said, the researchers expect that necessity would push more polar bears to hunt on land to avoid starvation. They also expect that the bears could learn from their fellow bears how to hunt on land until the practice becomes second nature.

阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。

    One day, my brother and I were alone in our apartment. The reason was that my parents had both gone for a ball party and had left me in charge of everything. I was doing my homework while my younger brother was watching television. Suddenly, the doorbell rang. Ding-Dong! Ding-Dong! My younger brother had rushed to the door before I decided to answer the door. We both thought that our parents had come home. As a result, he unlocked the door and opened it.

    Outside of the house stood a man who wore a black raincoat and black rubber boots. He looked no different from other people and he said that he was a salesman and asked politely if our mother or father was at home so he could talk with them.

    Without any thinking, my brother said, “No." He asked if we would like to buy some comic books, which he was selling. I quickly explained to him that we were not supposed to buy anything without our parents' permission. However, it seemed that he was not willing to follow my advice and he had an intention to enter our house.

    Then I realized something terrible would happen. As I was about to close the door, he forced his way into our house. He took out a knife and forced me to tie up my brother's hands with some rope which he took out from his pocket. I tied up his hands but I tied in a special way so my brother could untie himself as we often did. The man then tied my hands up and locked both of us in the kitchen.

    Soon he went upstairs to search the bedroom for something valuable. I managed to teach my brother to untie the rope on his hands. He then untied me. I rushed to the telephone to call the police, but the line was dead.

注意：1. 所续写短文的词数应为150左右；2. 应使用5个以上短文中标有下划线的关键词语；3. 续写部分分为两段，每段的开头语已为你写好；4. 续写完成后，请用下划线标出你所使用的关键词语。

Paragraph 1:

The doors were all locked from the outside and what's worse, I did not have the keys.                                                

Paragraph 2:

Just at the same time our parents came back home.                

    There was once a farmer who had a fine olive orchard. He was very hardworking, and the farm always prospered(蒸蒸日上) under his care. But he knew that his three sons did not like the farm work, and were eager to reach the goal at a single leap.

    When the farmer felt that his time had come to die, he called the three sons to him and said, “My sons, there is a pot of gold hidden in the olive orchard. Dig for it, if you wish it.” After the farmer was dead, the sons went to work to find the pot of gold.” Since they did not know where the hiding-place was, they agreed to begin in a line, at one end of the orchard, and to dig until one of them should find the money.

    They dug until they had turned up the soil from one end of the orchard to the other, round the tree-roots and between them. But no pot of gold was to be found. It seemed as if someone must have stolen it, or as if the farmer had been wandering in his wits. The three sons were bitterly disappointed to have all their work for nothing. The next olive season, the olive trees in the orchard bore more fruit than they had ever given; when it was sold, it gave the sons a whole pot of gold.

    And when they saw how much money had come from the orchard, they suddenly understood what the wise father had meant when he said, “There is gold hidden in the orchard. Dig for it, if you wish.”

写作内容:1. 以30个词概括上文的主要内容。2. 以约120个词就“Dig for it, if you wish it.”的话题谈谈你的想法，内容包括：①你对这句话的理解。②试举例说明。③这个故事给你的启发。

    [1]Stamp collectors usually collect stamps only from certain countries or regions. The traditional method of stamp collecting is to organize stamp collection according to the issue dates.

     [2]Of course, there are many    .  . You can collect stamps relating to a particular theme. For example, sport lovers may choose the Olympic theme. They try their best to find Olympic stamps issued by various parts of the world every four years. Some of them may want to concentrate on even more specific sport activities like ball games, gymnasium, swimming, etc.

     [3]If you like astronomy, you may be keen on collecting stamps describing the stars, planets, spacecraft, spacemen, etc. once you have fixed the topic, you no longer need to bother about stamps other than the theme you selected. Then, you can put all your effort to collect the stamps around it.

     [4]China issues zodiac animal stamps (十二生肖邮票) every year to celebrate the Lunar New Year. They are extremely popular and a lot of collectors wait patiently for 12 years to collect a full set of them. Hong Kong's Lunar New Year special stamp series began in 2000 with the Year of Dragon and the twelfth and final set was issued in 2011, the Year of Rabbit. Recently some Western countries have issued zodiac animal stamps, which attract a lot of attention as well.

     [5]You may choose any theme you like. However, you should bear in mind an essential point. The topic you choose should not be too narrow. Otherwise, it is very difficult to accumulate stamps around the topic. You will be depressed and even lose your interest in collecting stamps.

      [6]Collecting stamps with themes is especially popular among teenagers because there is a wide range of choices for them. The main challenge is how you organize and expand your collection around your theme.

    The bald eagle has been an official symbol (象征) of the United States for more than 200 years. Now it will share the stage with another American animal—the bison. Last spring, this huge, hairy animal became the country's national symbol.

    Bison, also known as buffalo, are the biggest land animals in North America. They have played a big role in American history.

    Long ago, millions of bison traveled across the U. S. Many lived in the grasslands of the Great Plains. For hundreds of years, American Indians in that area needed bison meat for food. They used the skins to make clothing and houses, and the bones to make tools.

    Later, many settlers moved to the Great Plains to set up farms and towns. They hunted bison in large numbers. By 1900, bison had almost died out. Only about 1,000 bison were left. Since then, people have worked hard to save the bison. Today, there are more than 400, 000 bison in the U. S. They live in protected areas and all over the nation. Their comeback is seen as a great success.

    To recognize the bison's importance in U. S. history, wildlife groups and American Indian groups asked U. S. lawmakers to make the animal a national symbol. Lawmakers passed a bill, or plan for a law, to do that. The President then signed the bill into law.

    U. S. Senator John Hoeven of North Dakota was one lawmaker who pushed to get the law passed. “The bison is an amazing animal,” he told Scholastic News. “It's a great symbol for a great country.”

    What kind of house will you buy in the future? Would you like to live in a house where your plants can call your phone to tell you that they need to be watered? Or a house that helps you cut your energy bill by turning off the lights when you leave a room? It may sound like science fiction, but it already exists! Come and visit the Smart Home at the Museum of Science and Industry in Chicago, Illinois. It will show how you can live a green lifestyle by making use of advanced technology throughout the home that makes your life easier and simpler.

    The Smart Home uses green technology to record the energy it uses, including electricity, water and gas. The house's energy dashboard (仪表盘) lets you know your energy use through your television and computer. The house greets you with the new information when you walk in the door. It is able to record when you enter and leave rooms, and can switch the lights, television and music off                    .

    The Smart Home is made entirely of recyclable and renewable materials. The furniture is made from used light bulbs, plastic bottles and other renewable materials, but you can't tell from just looking at them. The kitchen countertops (工作台面) are made of recycled glass.

    The entire house is designed to control the use of energy. The roof of the Smart Home has a sustainable vegetable garden, which does little harm to nature. Even the personal computer is green: it uses less power than a 60-watt light bulb. The house can raise and lower the window shades by itself.