①Henry often recycles water to clean his room and water the flowers. {#blank#}1{#/blank#}

②Daphne always turns off the lights and the computer as soon as she leaves her office. {#blank#}2{#/blank#}

③Mr White sometimes goes to work by bus or on foot instead of driving car. {#blank#}3{#/blank#}

④Li Lei usually uses QQ or e-mail to talk with his friends, he doesn't use paper letters. {#blank#}4{#/blank#}

⑤Miss Zhang doesn't wear fur(皮) clothes and she decides to eat less meat. {#blank#}5{#/blank#}

    The Browns are English. Now they are in Beijing. (1)This is their first visit to China.

    They are going to stay in China for three weeks. They want to visit some big cities and villages. They want to learn some Chinese, too.

    Mr Brown is a driver, and he likes driving in Beijing very much. Mrs Brown is a teacher. She is visiting a school in Beijing. Their son Jim is a middle school student.

    Many people believe that not only wetness, but also light and dirty things are the greatest enemies of stamps. People protect their stamps in several different ways.

    In fact, we should never touch the stamps with our hands. This avoids moving dirty things onto them. Stamp tweezers (镊子) should be used in all conditions.

    Stamps are printed things. The colour will slowly disappear if they are put in the light for a long time. So we should not put stamps in the light for long. Direct sunlight must be avoided as well.

    Wetness is an important problem for stamps. Some collectors will put stamps in separate plastic bags. However, it is possible that some stamps have taken in some water from the air before they are put into the plastic bags. Stamps become yellow easily and rapidly after they take in wet air. To protect the stamps, some people also put the stamps into a special room which has a machine to keep the air cool and dry. However, not many people can afford that.

    To keep stamps, stamp collectors usually put them under plastic covers. It is a common and simple way. This helps because the plastic cover keeps the stamps off the wet air. It also stops the fingers from touching the stamps.

    Some collectors prefer to store stamps inside a plastic box with desiccants (干燥剂). However, we should take care not to let the stamps touch the desiccants. On top of that, don't take your stamps out on a wet day.

    Mistakes are great teachers. Success comes to those who are willing to risk making mistakes to achieve their goals and wishes, and who are able to learn from those mistakes. And in order to learn from mistakes, you must be willing to pay for them.

    Mistakes can be very valuable, but when you try to get others to pay for your mistakes, then you lose the chance to learn from them. When something goes wrong, it's usually very easy to find someone else's mistakes, but is that useful?

    Much of the value of mistakes comes from the fact that they need a cost that must be paid. The person who learns the most from a mistake is the one who pays the price for that mistake.

    When you make a mistake, what you shouldn't do is to run away from it. You need to accept it because you can learn a lot from it. The mistake has been made, so make the most of it. Pay the price, learn the lesson, and grow that much stronger.

When you make a mistake, don't look back at it long. Remember the causes, and then look forward. Mistakes are lessons of wisdom. The past cannot be changed. The present is still in your power. Make full use of your mistakes to achieve your goals and wishes.

Astronauts would face dangers both getting to and surviving (生存) on Mars. Let's learn about surviving a trip to Mars.

What would it take to keep people safe and healthy on a trip to Mars? Scientists are already working on it, though the trip may be many years later.

Over the last 60 years, many spaceships have flown by orbited（沿轨道运行）and even landed on the Red Planet. However, machines cannot replace humans. That's why the United States, China and other countries want to send people to Mars. But surviving on this trip would not be easy.

A trip to Mars would be the farthest journey in human(人类) history. Mars is about 225 million kilometers away, so it would take astronauts at least 180 days to reach there. However, it only takes a few days to get to the Moon.

Space travel is dangerous. For one thing, staying in space for long periods makes the human body weak. Also, it puts pressure behind the eyes and causes eye problems. But gravity(重力) machines could help.

Then there's space radiation(辐射) to worry about. It is bad for astronauts when they have long journeys. Scientists are working out the issue. They have found that taking certain vitamins can help.

Astronauts will have to pack light to lift off from the earth. But they won't be able to get the things they need easily. Astronauts on the space station practice for this by growing lettuce and other food in space. Engineers are developing 3D printing techniques（技术）which can allow future Mars astronauts to build what they want.