It was nearly seven o'clock, when a man walked into a bar, ordered a drink and turned to watch the television.

    The seven o'clock news was on and it was showing a man standing on top of a tall building. He was looking down at the crowd of people below.

    On the ground, a police officer with a megaphone(扩音器)was trying to tell him not to jump.

    "Let's talk about your problem," the police officer was saying. "Perhaps we can help you."

    The man turned to the bartender(酒吧侍者)and said, "I bet you a hundred dollars he doesn't jump.

    The bartender looked at him. "You're offering me a hundred dollars if he jumps? Is that right?"

    "Yes. I don't think he'll jump."

    The bartender smiled. "OK. You've got a bet."

    The man turned back to the TV and watched it carefully. The bartender, however, did not seem to be very interested. He continued washing glasses and serving the other customers.

    Then, after about five minutes, the man on the building threw himself off the building and fell to the ground.

    The man in the bar turned to the bartender.

    "He jumped," he said. "You win."

    He held out a hundred dollar bill to the bartender, but the bartender would not take it.

    "I can't take your money," he said. "I knew I couldn't lose. That story was on the six o'clock news. I saw him jump."

    "Well, yes, so did I," the man said, "but I didn't think he'd do such a stupid thing twice."

    One day, Jack's parents told him that his grandpa would retire (退休) after working for forty years. Jack said1, "I'm only seven, so it means my grandpa has been…er…a really long time!"

    His parents said, "Yes. There is a (n)2place in his heart that we don't know how to fill. That's why we are going to have a surprise party for him."

    Jack loved his grandpa and wanted to do something3for him. He remembered the business card his grandpa had given him two years before. He knew that his grandpa would no longer hold the position on that card, so he decided to build a new one for his grandpa.

    When the big night came, Jack was4. He put his gift in a small box. But he didn't want to put his gift together with others'. He carried it around with him the whole5.

    When all the other people6, he took his grandpa's hand and brought him over to a chair and gave him the gift.

    His grandpa smiled, "Well, it must be a beautiful7. May I open it now?" "Sure!" Jack said excitedly.

    As Jack's grandpa opened the gift, tears came into his eyes. He was touched by Jack's gift. Jack gave him the greatest gift he had8got! It was a business card with his new position FULL-TIME GRANDPA! Jack said, "Now your9job is my grandpa."

    "Well10do l get paid?" his grandpa asked, smiling. "As many hugs (拥抱) as you want!" With these words, Jack gave his grandpa a hug. "Well, I guess that means I'm the richest man in the world!" said the grandpa.

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.

Tony lives in a big house, and his family is rich (富有的). He has a bad 1 . He always wastes (浪费) food. For example, he 2 eats half of an apple and throws away (扔掉) the other half. His mother always 3 him not to do that, but he doesn't 4 his mother. He thinks his father has a lot of money, so it's not a big deal. "My mother is too strict 5 me," he says. He doesn't like exercising, 6 . His home is not far from school, but he never walks 7 rides a bike to school. He asks his mother to take him to school in the 8 . He says to his mother. "We have a car, so 9 do I need to ride a bike or walk to school? Walking 10 me tired."

One day, in a geography class, his teacher 11 some pictures of Africa to Tony and his classmates. Many 12 have no food to eat there. They are thin because of hunger (饥饿). Their teacher asks them to 13 money and do something to help them. Tony feels 14 for what he did before. He knows what his mother did is to help 15 develop (养成) good habits.