How does a young dog or cat get to know a new home? The animal uses its nose. Right away it smells its new places. Then it makes wider and wider circles, smelling all the time. Before long it can find its way home very well, even in the dark. It simply follows something it knows well.

    Stories happen about animals who found their way across land they had never smelled before. Take the case of Smoky, a small white cat. Smoky had some funny red hair around its right ear. One day Smoky and his owner began a long journey. They were moving from Oklahoma to Tennessee. When they were just eighteen miles from their Oklahoma home, Smoky jumped out of the car. Then he found his way back to the old house. There he wandered around outside for many days. Finally he disappeared.

    A year later Smoky meowed at the door of a house in Tennessee. A man opened the door. "Is that you, Smoky?" he said in surprise. At first he couldn't believe it. Then he saw the red hair around its right ear. It was Smoky!

    The polar bear is a very big white bear. We call it the polar bear because it lives in the Arctic Circle（北极圈） near the North Pole.

    The polar bear lives in snow and ice. At the North Pole there is only snow, ice and water. There is not any land. The polar bear has a very warm coat because the weather is cold in Arctic Circle. You can't find the polar bear easily in the snow because its coat is white.

    A grown-up polar bear is usually about three meters long and weights about 450 kilos. It can stand up on its back legs because it has very wide feet. It can use its front legs like arms. The polar bear can swim very well. It catches fish and sea animals for food. It goes into the sea when it is afraid. People kill the polar bear for its beautiful white coat. The governments of Canada and United States call on that people should stop killing polar bears. They don't want these beautiful animals to die out.

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If you get really nervous when you have to perform in front of many people, you're not {#blank#}1{#/blank#}. It's a very common fear. Even some very experienced actors and musicians get very stressed before performing. Some people say that {#blank#}2{#/blank#} makes them give a better performance, but other people can feel so nervous that they can't perform at all. This is a very {#blank#}3{#/blank#} problem because it influences their confidence and even career. 

The most useful thing to do if you worry about a performance is to try to {#blank#}4{#/blank#} Don't think about all the things that could go wrong. Instead, keep calm and think of a good result. Before the performance, imagine people cheering. Think about how good you will feel after a successful performance. And remember, if you make a few small mistakes, {#blank#}5{#/blank#} people won't even notice. 

Most of us spend all day at school or work. After a long and busy day, all we want to do is to return to a comfortable home. Smart technology can turn any home into a nicer place to live in.

Smart homes have been around for some time. A company called Pico Electronics invented a type of technology called X10 in 1975. As the curliest smart home technology, it allows household devices (家用设备)，such as lights and alarms, to communicate with each other by using radio waves.

Of course, 5G network connectivity has made smart homes much more complicated (复杂的) than X10. Perhaps the most popular smart home technology is the voice-activated assistant. Users are allowed to communicate with almost any device in their homes simply by speaking a few words. This is especially convenient for children and people with disabilities, as the devices can help them finish tasks that would normally be too difficult.

Common household devices can become "smart as well. For example, smart fridges can create dinner recipes with the vegetables that are being kept inside.

But smart homes are not just about convenience. They are also good for the environment. By regularly checking your energy use and automatically (自动地) turning off lights and other devices that you' re using, smart homes can lower much electricity you use. Using less energy means that we use fewer natural resources (自然资源)，which is good for the environment.

要求：（1）书写规范；（2）文中不得出现真实的姓名和校名；（3）词数40词左右。

More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment(环境). Maybe that's why there are 1. 4 billion(十亿)bicycles and only 400 million cars on roads all over the world today. Bikes can take you almost anywhere, and there is no oil(油)cost!

Get on a bicycle and ride around your neighborhood. You may find something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your car. You can bike to work and benefit(受益)from the funny exercise without polluting(污 染)the environment. 

Health Benefits of Bicycling: 

First, it helps you keep a good heart. 

Second, you aren't afraid of getting fatter and fatter any more. A 15-minute bike ride to and from work three times a week can lose your five kilos of fat in a year. 

Also, bicycling can make you happy. Exercise like bicycling can make people feel better, more relaxed(放松的). . 

So, bicycling is healthier than driving.