According to a recent survey, violence (暴力) did happen in schools. Students showed their fear and parents and teachers were also     1     (annoy) at it. Experts hope     2     whole society should pay more attention to the mental health of     3     (teenager).

The topic of school violence is     4     (particular) hot now, and it calls for our great concern. We should try our best     5     (stop) violence happening at school because more and more students     6     personal safety could not be guaranteed (保证) would drop out of school. In fact, violence can     7     (learn). Children learn violent     8     (behave) from adults or from what they see on television or on the Internet.

If I meet with school violence, I will not answer violence with violence, for it will lead     9     more fighting. I will tell my teachers and parents about it. I think they will help medeal with it well and protect me from the bad guys.

All in all, we students should be responsible for     10     (we) and keep away from violence.

4 . A study of 3,884 students from primary schools to colleges found that examinations made 83.1 percent of primary students anxious, and more than 40 percent of high school children were out of sorts (身体不适) because of stress and anxiety.

Moreover,75 percent of the high school respondents admitted, that they had problems talking to their parents and more than 55 percent of them found it hard to associate with other people, according to the study.

It is not difficult to conclude that our children are not happy.

Today’s kids are coming home from school weighed down with backpacks full of books and worksheets. They are spending hours at desk at night, seldom going outside to play and getting to bed late.

How can this be a good thing? Homework is eating away children’s time to play freely with neighborhood kids-and more importantly, their time to sleep.

Homework can enrich the education process. But like all things, too much of it may dampen (减少) a student’s enthusiasm for learning. To raise cheerful, contented and well-mannered children, parents need to put in a lot of time and effort. Their eyes should go beyond their children’s preparations for tests. Children need a break too. So let them be in control of parts of the day.

6 . Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn’t know for sure? That the evidence was inconclusive, the science uncertain? That the anti-smoking lobby(游说) was out to destroy our way of life and the government should stay out of the way? Lots of Americans bought that nonsense, and over three decades, some 10 million smokers went to early graves.

There are upsetting parallels today, as scientists in one wave after another try to awaken us to the growing threat of global warming. The latest was a panel from the National Academy of Sciences, enlisted by the White House, to tell us that the Earth’s atmosphere is definitely warming and that the problem is largely man-made. The clear message is that we should get moving to protect ourselves. The president of the National Academy, Bruce Alberts, added this key point in the preface to the panel’s report: “Science never has all the answers. But science does provide us with the best available guide to the future, and it is critical that our nation and the world base important policies on the best judgments that science can provide concerning the future consequences of present actions.”

Just as on smoking, voices now come from many quarters insisting that the science about global warming is incomplete, that it’s OK to keep pouring fumes into the air until we know for sure. This is a dangerous game: by the time 100 percent of the evidence is in, it may be too late. With the risks obvious and growing, a prudent person would take out an insurance policy now.

Fortunately, the White House is starting to pay attention. But it’s obvious that a majority of the president’s advisers still don’t take global warming seriously. Instead of a plan of action, they continue to press for more research — a classic case of “paralysis by analysis”.

To serve as responsible stewards of the planet, we must press forward on deeper atmospheric and oceanic research. But research alone is inadequate. If the Administration won’t take the legislative initiative, Congress should help to begin fashioning conservation measures. A bill by Democratic Senator Robert Byrd of West Virginia, which would offer financial supports for private industry, is a promising start. Many see that the country is getting ready to build lots of new power plants to meet our energy needs. If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.

8 . You might think people all over the United States have Wi­Fi — wireless Internet service — and mobile phones. But there is no such service in Green Bank, West Virginia, a tiny town four hours from the US capital, Washington D. C. Fewer than 150 people live in Green Bank, which has two churches, an elementary school and a public library. It is also home to the largest radio telescope in the world.

There is a ban (禁令) on Wi­Fi in Green Bank, along with anything else that can create electromagnetic (电磁的) waves. Officials say the waves could disturb the signals (信号) the telescope receives.

For many Americans, a visit to Green Bank is a little like returning to the 1950s. To get there, you must read road signs because there is no GPS service in the town. People can connect with the Internet through telephones, but wireless service is not allowed.

The observatory (天文台) is one of the largest employers in the area. The National Science Foundation (NSF) spends about $8.2 million a year to operate the observatory, telescope and educational center.

Jonah Bauserman is a technician. If he supposes there is a signal that is not allowed in the zone, he drives to the house where the signal is coming from and checks it. But once a week, when the device is cleaned, some banned devices are allowed near it.

People in the town respect the work of the scientists. And they say they are happy to live without Wi­Fi and mobile phones. “You know, instead of sitting here with our phones and other devices we’re out fishing, hunting and going to each other’s houses.” Everyone knows each other and communication is almost always face to face.

10 . Most children now chat daily either online or through their mobile phones.     1     Some are shy in real life but are confident to communicate with others online; others find support from people of their own age on relationship issues, or problems at home.

Sometimes the online world, just like the real world, can cause problems, such as bullying (恃强凌弱) or arguments.     2     But there are also a few people who use the Internet for illegal aims. Children must be made aware of both the good things and the dangers.

    3     Just as you decide which TV programs are suitable, you need to do the same for the websites and the chat rooms your children visit. Remind your children that online friends are still strangers. Reminding them of the risks will keep them alert (警惕的).

    4     So it’s likely that your children may know more than you do. We get left behind when it comes to the latest gadgets and the interactive areas of websites, like chat rooms and message boards.     5     Chatters love to use abbreviations (缩略语) such as: atb (all the best), bbfn (bye bye for now), Idk (I don’t know), xlnt (excellent).