What would the world be like if cars could drive themselves? Imagine seeing an empty car passing by on its way to pick up its owner, or a car full of passengers who are reading, listening to music or even sleeping. But none of them are worried about the road ahead.

      Well, all of this could be the future of driving. There are several companies, including Google, working on driverless cars. So far, no Google self-driven car has gotten a traffic ticket, but some of them have been in accidents when other cars hit them.

      These cars are now still in the testing stages. But, if the tests are successful, these electric self-driven cars could be put into use very soon.

      The cars already have many features（特点）allowing them to take the place of drivers during certain situations. Some features include cars being able to park themselves, or slow down when they notice objects close by. They can also control the speed if there are dangerous conditions.

      Scientists and engineers believe, with the help of wireless signals, cameras and GPS, we are now at a stage where creating a safe self-driven car might be possible.

      The cause of deadly road accidents is usually careless drivers or dangerous conditions. The self-driven car may be able to prevent these. However, some people do not like the idea. American lawyer Whit Drake, for example, doesn't believe these cars are safe. He thinks that technologies can also be mistakes.

    Every year on April 22, People all over the world celebrate Earth Day. It is a time to work to keep our earth clean. People plan projects to clean up the land, air and water.

    U.S. Senator Gaylord Nelson first thought of the idea for Earth Day in 1962 when he saw polluted rivers and cities with smoke. He needed to get support from Americans to clean up the earth. Finally, on April 22, 1970, 20 million Americans celebrated the first Earth Day! Now many countries around the world celebrate it, and you can, too.

    How can you celebrate Earth Day? Here are a few ideas:

    Join a clean-up project-Clean up your street or a favorite beach.

    Save energy-Turn off the lights when you leave a room, and use public transportation.

    Use less water.

    Reduce(减少)/ Reuse/ Recycle ― Practice the three Rs: First, reduce how much you use. Then reuse or recycle what you can.

    You can make a difference on Earth Day and every day!

No one can be happy all the time. You may become unhappy sometimes. Do you know what to do with that? Maybe you can do the following things. They can help you become happy again.

A. The Louvre Museum

 This year, the museum has a special exhibition for Olympics, which looks back at the first-modern Olympic Games, held in the 19th century.

B. Champs-Elysees

 On this world-famous street, stores are setting up new outdoor seating areas for the Paris Olympics. Visitors can go shopping and enjoy themselves in wining and dining there.

C. The Are de Triomphe

 The 50-meter-tall arch has statues(雕塑) that tell stories of wars. Visitors can climb to the top to enjoy a bird's-eye view of Paris.

D. Pont Alexandre III

 This bridge goes across the Seine River in Paris with four big columns holding up statues. These statues will make a great background for events like the swimming marathon(马拉松).

E. Parc des Princes Stadium

 It is also one of the outstanding soccer stadiums. It is special because of its modern design. The oval shape and columns make it look cool.

F. Stade de France

 It is a stadium that once hosted World Cup of Soccer. For the Paris Olympics, the track in the stadium will be purple for the first time. The color will fill the stadium when the Games start.

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