仔细阅读下面的短文，在思维导图的空白处填入恰当的内容。

Carpooling (拼车) for School

    In the US, students often carpool. When your school doesn't have a school bus and your home is not near, you can carpool. Usually three or four students go to school in the same car. Their parents take turns (轮流) in taking the students in their cars.

The students have to be on time, because nobody wants to be late for class. If you are in the car and wait (等) for a friend for a long time, you will be unhappy. Your friends will feel the same way when you let them wait. Students learn a great lesson—to be on time.

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Summer holidays are coming soon. Are you going to travel? If you plan to take a plane, you will have a healthy trip by following these suggestions:

    Do you know that a student can produce up to 240 pounds of school waste and lots of waste gas (气体) during a term? This includes transportation, food, paper, pens, pencils and so on.

    Transportation    Some parents drive their kids to school every day. We all know waste gas from cars is a main cause air pollution. If parents who live in a neighborhood can take turns to drive their kids to school each day, that'll be better. Another way of going green is to walk to school if students live near their schools.

    Food    It's surprising that only one elementary school can produce up to 19,000 pounds of lunch waste each year. That's only one school. One way to help take care of the environment is to stop using plastic bags. There are all kinds of environmental boxes for students to put their food in.

    Paper, pens and pencils Lots of paper is thrown away by American students. They throw away about 1.6 billion pens every year. They waste many pens and chemicals (化学药品) in them are bad for the environment. Many more pencils are thrown away than pens. Pencils are made from trees, so if more pencils are thrown away, more trees will be cut down. So students should reuse (再使用) paper, pens and pencils instead of throwing them away.

    Backpacks As fashion comes and goes, almost every kid needs a new backpack every year. They can save lots of money and materials if they reuse the same schoolbags each year.

    The giant panda is one of the most popular animals in the world. A giant panda can grow to be 1.5 metres tall and weigh up to 150 kg. People think the giant panda is very lovely. So it is not surprising that the World Wide Fund for Nature chose the giant panda as its symbol. The WWF tells people that giant pandas are in danger and raises money to save them.

    The giant pandas only live in China. There are fewer than 1, 600 giant pandas left in the wild. The main reason why pandas are endangered is that the area where pandas can live has become smaller.

    The WWF works to help giant pandas in the wild in many ways. One of the ways that help them is to increase the size of panda reserves. Some reserves need to be joined together by planting bamboo between them to make "corridors(通道) ". These are paths that lead from one reserve to another. No one may harm the pandas in these areas. The corridors let pandas move from one habitat(栖息地) to another to look for food.

    People are working very hard to make sure the giant pandas do not die out.

    When the Titanic was built, she was the largest ship in the world. It had taken 50,000 men two years to build her. She was 269 metres long and as high as an eleven storey building. She was huge! In fact, the word "titanic" is often used to describe something which is "very powerful, strong, important or large".

    It was built because of increased tourists travel between North America and Europe. The Titanic was like a floating palace. Everything about her was beautiful and comfortable. She was also impossible to sink or that's what everyone thought.

    The Titanic left Southampton on the south coast of England for New York on 10 April, 1912. She stopped first in France and then in Ireland before setting off across the Atlantic Ocean. There were 1,632 passengers on board; 907 crew members(船员) looked after them.

    Four days after leaving Southampton, the Titanic's captain received not one but four icebergs(冰山) warnings.

    Icebergs are very dangerous for ships- only 10% of an iceberg can be seen above the water. But the water was clear and the captain decided to continue without reducing the ship's speed. At 11:40 p.m. the ship hit an iceberg, which cut a hole about 100 metres long underwater. The passengers were not told, but the Titanic could not survive this terrible damage.

    It was dark and freezing cold. The ship was filled with water. There was no time to waste. Women and children were told to climb into the ship's lifeboats. But there were not enough lifeboats for all the passengers. Finally, at 2:20 a.m. the Titanic sank to the bottom of the sea. 916 passengers and 673 crew members died in the icy water.