The bicycle is one of the ___  (1)  ____ yet most useful inventions in the world. The surprising thing is that it was not ____(  (2)  ____ earlier, although the great inventor Leonardo da Vinci(利奥纳多·达·芬奇)had drawn pictures for bicycles and also for flying machines and some other things. Those things were not produced ___  (3)  ____ long after he died.

   A person riding a bicycle uses very little energy(能源)to make the bicycle move, and there is no pollution at all when you are riding ,Even so, in developed ____  (4)  ____, most people don't travel to work by bicycle. It is not because the bicycles are expensive or people feel ____  (5)  _____ if they ride to work. It's because ___  (6)  ____ cars on the roads becomes larger. It certainly becomes ___  (7)  ____ to ride a bicycle. As a result, more people put their bicycles away and go to work in their cars and, in this way, the situation(情形) is made worse.  ____  (8)  ____ the best way to make riding safer and more popular is to build road only for bicycles, and to make ____  (9)  ____ so difficult and expensive ____  (10)  ____ drivers to take their cars into the city that they will go back to using their bicycles.

The Internet is useful. It is becoming an important   (1)   of our lives. We can use the Internet to get information, make friends, send emails, watch movies and so on. Now,   (2)   children are using the Internet, too. But I think parents or teachers should always   (3)   the children when they use the Internet.

There is   (4)   in charge of（负责）the Internet. It’s easy to get wrong information on the Internet. Someone may cheat people on the Internet. Some information and pictures are  (5)   for children. Also, it’s dangerous to let children   (6)   chat rooms by themselves. Parents should know who their children are talking to. What’s more,   (7)   in front of a computer for a long time isn’t good for children’s eyes. So children shouldn’t spend

  (8)   time on the computer.

In a word, the Internet can change our lives   (9)   the better. But I strongly believe that it is   (10)   for parents to watch their children when they use the Internet.

There is nobody in the world the same  (1)   you. You are unique (唯一的)! Everybody is   (2)  from everyone else. That is good!   (3)   it makes the world an interesting place.

There are people taller  (4)  you, and shorter than you. Maybe your hair is the same color as your friend’s, but maybe it is longer than _(5). Another difference is your hair may be straight(直的) , hers may be curly.

I am sure you have some friends who are   (5)  than you. And you also have some friends, they are as  (6)  at sports as you. But there are also people around you who are not good at some things.

  (7)  does your best friend look like? Do you both   (8)  to finish your homework at school? Do you both want to wear the same clothes every day? I think   (9)   some ways you are the same, but in many other ways you are different.

So say loudly to the world, “I am who I am –I’m unique!”

As we all know, Chinese students are hard-working. But they’re   (1)  at the same time.

At school, they have to follow the strict school  (2)  . For example, they   (3)   have long hair or wear strange (奇怪的) clothes.

And at home, they’re always busy with their homework and they don’t have any free time to do what they like. Once they don’t do well in exams, their parents will lose   (4)   for them.

On weekends, their parents tell them to take part in different classes they don’t like. They always feel   (5)   and bored. They   (6)   interest in school things slowly. Some students can’t   (7)   it and leave home. Because their parents only care about children’s study and they never   (8)   what they want.

“Many students can do nothing  (9)   study. Some students even don’t know  (10)   to get on well with others and how to take care of others,”said an expert (专家).

   “This is a serious problem. It’s necessary for us to think it over and solve it well,”said another expert.

You may have heard that many animals are endangered.What does that mean  (1)  ? Endangered means there are very few of that kind still   (2)  . Someday they might die out. You may wonder   (3)   people can do to help endangered animals.

People  (4)  some ways to protect plants and animals from becoming endangered or extinct. One way is to protect the animalsˈ or plantsˈ habitats. Some governments have set aside  (5)  for parks. No one  (6)   to disturb the habitat inside park lands. People cannot build houses there. They cannot hunt animals. No one can collect plants or animals from  (7)  the park. Mining and drilling(打孔) for oil is prevented in parks.

People have made the laws to protect plants and animals. Laws  (8)  be made to protect habitats. Hunting laws do not allow people to hunt certain animals. Some laws limit the   (9)  of trees that can be cut down in forests. Other laws  (10)  that people cannot build homes, factories, or stores in certain places. Laws can protect the air and water from pollution.

     Walking in an American middle school, I see groups of students,   (1)  ) cliques (小集团)， talking and walking together. If you go to a middle school I see the same. These students do almost  (2)  together: eat lunch, do homework, play sports, and go to movies.

    We all need a group of   (3)  . They are the ones we run to tell how well we did on the last test. They listen when we complain how our parents made us do homework  (4)  playing with our best friends. They help us with hard homework problems.

       But like everything else, cliques can be bad. What happens if a close friend (let’s call her Sally) has a fight with   (5)  friend (Joe)? Sally stops talking to Joe, and that’s not all. She   (6)   wants you to stop talking to him, even though Joe and you have been friends for two years.

      What can you do? The best way is  (7)  to Sally and tell her you do not want to be involved (卷入) in the argument. Tell her that this fight is not between you and Joe. Tell her that you want to be friends with   (8)  ) of them. If she is a good friend she   (9)  ) Then, you should also try to help them talk with each other again!

    Be kind and  (10)   all your friends, whether some of them are not talking to one another. You have the freedom to talk to all of them and to help all of them.