Tornadoes(龙卷风) are one of the worst weather events on earth. Each year, tornadoes kill many people. The storms often carry homes, cars and trees from one place to another. And they can also destroy anything when they pass by.

      A tornado comes from a thunderstorm(雷雨) in the sky down to the ground. It is big at the top and small at the bottom.

      A tornado appears when winds in different directions meet in the cloud and begin to turn in circles. People can see tornadoes almost everywhere in the world. But most happen from late winter to middle summer. There is a second high season in November. During spring, warm air moves north and mixes with the cold air left from winter. In November, the opposite happens. Cold air moves south and mixes with the warm air left from summer.

      Tornadoes always come suddenly. Weather scientists have done something to predict(预测) tornadoes. But the storms often move too fast for people to protect themselves. Last year, tornadoes killed more than one hundred people in United States.

      Scientists say the best place to be in is a small room, without windows, in the middle the lowest part of a building when tornadoes come.

    In most parts of the world, many students help their schools make less pollution. They join environment clubs. In an environment club, people work together to make our environment clean.

    Here are some things students often do.

    No-rubbish lunches. How many lunch bags do you throw away after lunch? Environment clubs ask students to bring their lunches in bags that can be used again. Every week they will choose which classes make the least rubbish and report them to the whole school.

    No-car day. On a no-car day, nobody comes to school in a car including the students and the teachers. Cars give pollution to us, so remember:

    Walk, jump, bike, or run!

    Use your legs! It's lots of fun!

    Turn off the water! Do you know that some toilets can waste twenty to forty cubic (立方) meters of water an hour? In a year, that would fill in a small river. In the environment clubs, students repair those broken toilets.

    We love our environment. Let's work together to make it better.

    There are many online food shopping sites. Things l{#blank#}1{#/blank#}CDs, books, and DVDs sell well online. But it is quite different to sell food online because people like to see food with their o{#blank#}2{#/blank#} eyes. It is very I {#blank#}3{#/blank#} for people to buy fresh fruit and vegetables. Customers like to c{#blank#}4{#/blank#} their food by its color. They also want to touch and smell it. Some people like going to the same shop to buy food with good quality. So if the food is always g{#blank#}5{#/blank#}, they will feel comfortable buying it online.

    Boxes of fruits and vegetables have been d{#blank#}6{#/blank#} to homes around Britain for a few years now. Dried or canned foods are almost the same all the time, but fresh things are not. For example, People may want to pick their own apples so they can take the o{#blank#}7{#/blank#} that look nice. Buying dried and canned food online is easier. A person can buy this kind of food on the Internet and then buy fruits and vegetables at a store or a market.

Our brain is the most important part in our body. It helps us to think, speak, feel, and move. It's no wonder we need to look after it and just like the rest of our body. We need to keep it exercised to keep it healthy.

Our brain is made up of 86 billion neurons—or nerve cells (神经元), but as we age, some of these gradually die off. In serious situations, nerve cells in different areas of the brain become hurt and finally die, leading to a condition called dementia (痴呆), which influences a person's ability to think properly.

It's a good idea to train our brain by learning ways to increase our memory and intelligence. For example, solving crossword puzzles (字迹) can be really helpful. Dr Catherine Loveday, who's a neuropsychologist, thinks learning a second language is also great for the brain, as it requires us to switch (切换) between languages, making our brain stronger.

However, if you don't speak another language, there are still ways to train your brain. If you're right-handed, try performing tasks like brushing your teeth with your left hand to improve your brain.

The main reason we do these exercises is to keep our brain active. It can help to develop additional abilities to help protect the brain against the loss of memory or thinking. Dr Catherine Loveday, says, "Even if people take up languages or other activities later in life, it will provide them with a degree of protection." As an old saying goes, "It's never too old to learn."

According to a study, people are surprised to know about that eating chocolate might increase our ability to get and use knowledge. It could improve how you learn and use information. Although it might not be good for the rest of your body, at least it could make you a brain box!

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Near the hometown of the giant pandas sits the Leshan Giant Buddha, which is one of the most popular places for tourists at home and abroad.

The building of the giant Buddha started in 713. At that time, floods(洪水)often happened in Leshan area where Min River, Qingyi River and Dad u River ran together. Chinese monk (僧侣) Haitong decided to lead people to build a Buddha sculpture to deal with the waters that did harm to the boats traveling down the rivers. It was a super project in ancient times, which required lots of money.

Haitong went to many places to raise money, and after years, he finally raised enough money to start the project. When he got back to Leshan, the officials wanted to force Haitong to hand in the money. Haitong refused even though the officials sent soldiers (士兵) many times. He gouged (挖) his own eyes out to show his sincerity (真诚), scaring the soldiers away.

In the year 713, Haitong started the building of the Buddha, but he passed away when the giant Buddha was built to shoulders. Because of the death of Haitong, the building of the giant Buddha was forced to stop. Later, after many difficulties it was finally completed in 803.

The stone Buddha is the tallest Buddha sculpture in the world with a height of 71 meters. It was listed as a UNESCO World Heritage Site together with Mount Emei in 1996.

March 20 is a special day. It's the International Day of Happiness! The United Nations (UN) made this day to remind everyone that being happy is important.

{#blank#}1{#/blank#}Leaders of the country wanted to know how happy its people were. So, they created the Gross National Happiness (GNH) Index ( 国民幸福指数 ) and did its first GNH survey ( 民意调查 ) in2008 to measure the happiness of its people .

Bhutan's interest in happiness caught the world's attention. Then the UN agreed in 2012 to create the International Day of Happiness.{#blank#}2{#/blank#}

People get joy from many things like friends, family, good health and a clean environment.

Every year on March 20, the World Happiness Report comes out to show what makes people happy and how happy people are in different countries around the world.

Maher Nasser from the UN helped make the International Day of Happiness.{#blank#}3{#/blank#}"I want to make every day an International Day of Happiness," he said.

Nasser thinks that governments can help by making their people happier and healthier. But it's not just up to governments. {#blank#}4{#/blank#}For- example, helping others can make us feel good about ourselves and that makes us happier.

The International Day of Happiness is more than just a happy day. It's about making a better world together .

What else can you do to make yourself happy? (15词以内) {#blank#}5{#/blank#}