“Time is money。” This saying means that time is very valuable。 But time is more valuable than money. The money we have lost can be gained again, but the time we have wasted cannot be regained. Moreover, sometimes persons can exist without money， but nothing can be done without time, just as no one can live without air.
Despite being so valuable， time is often neglected by men. Since time is an invisible thing， men often waste their time unconsciously（无意地）. Without anything to do， they may gossip from morning till night.
can live only at most to about 100 years. It seems fairly long， but in fact it is rather short。 We often say “How quickly time flies！\" How many things can a man accomplish in such a short period? Hence we should use the valuable time properly to do our work. We will race with it. We will study and work hard。 Never waste a little bit of it.
Try to Be a Good Student
Perhaps it is the dream of everyone to be a good student at school, but quite a few students feel at a loss on how to make it。 In my opinion， it is rather easy if you can act on the following points。
First of all, make full use of your time and work hard。 Don’t put off till tomorrow what should be done today， as time past will never come back. The fast developing society requires adequate knowledge， which presses us to spare no efforts to study。 Of course, your hard work will be rewarded one day.
Secondly, use your own head and present your point of view. Credulous（轻信的）attitude will only make you take anything for granted。 With your own judgment you will be able to tell right from wrong and set up your own theory.
Thirdly， set aside enough time for relaxation， entertainment, etc. don't ignore the harm of all work and no play。 Proper sports will build up your body and improve the efficiency of your studying.
To be a good student is easier said than done， for it needs a student’s consistent efforts。 But nothing is difficult to a man if he puts his heart into it.
Natural Resources
Nature has provided us with many kinds of resources. Almost everything we use in our everyday life comes from Nature. The food we eat， the water we drink, the clothes we wear， the concrete and bricks to build our houses， the materials to make bikes we ride， etc。 all come originally from Nature.
People have been making use of these natural supplies for thousands of years. With the development of technology and the increase of the population, the amount and range of materials taken has increased。 It is estimated that this tread will continue in the years to come.
However, natural resources are not in exhaustible。 Some resources are already nearly used up。 For example， the end of the world’s fuel is already within sight. Such an essential daily item as water is in short supply in many parts of the world. We can no longer thoughtlessly use the many resources provided by Nature。 We must learn to conserve what remains。
We Have Only One World
When industries grow, pollution also grows。 Today the problem of environment has become more and more important。 The world population is rising so quickly that the world has become too crowded。 We are using up our natural resources too quickly and at the same time we are polluting our environment with dangerous chemicals. If we don’t take action immediately, then we will destroy our only world.
Man has made great progress in environment protection. Government of many countries has established laws to protect the forest and sea resource and to stop the environmental pollution.
Still more measures should be taken to solve the problem。 First, we should start by educating the public about the hazards of pollution。 The government on its part should also design stricter laws. This is not only for our own generation but also for the future generation to come.
It is necessary to protect our nature environment. We must begin now to protect our only world.
Make The Best Use of Our Land
It is the land that has been providing us with everything we need for centuries. In other words, almost everything we use daily comes from the land directly or indirectly. The food, clothes, houses, even the books and furniture are all supplied by the land。 But the limited land is decreasing at a surprising speed。 With the expanding of the cities， the development of the industry and over population， lots of large pieces of good farmland are being turned into residential areas with many houses and apartment buildings， or industrial areas， or warehouses.
Therefore some measures must be taken to stop the abusing of our farmland. On the other hand， we should let everyone realize the danger of being short of land。 And also we should educate them how to make better use of our land.
Health
It is said that we do not properly value a thing until we have lost it。 It is only when a friend dies that we find out how much he was to us。 So it is with health。 When we are young and strong and have good health, we think little about it. It seems natural to us to be always well， and we cannot imagine what it is like to be ill. Wo we are often careless about our health, and without thinking we spoil our health by bad habits and doing silly things. It is only when we have our good health that we find that it was one of God’s best gifts to us。
Health is our most important possession。 We should do our best to maintain it. Good health is necessary to happiness and success。 People who are in poor health are often pessimistic or depressed。 As a rule， bad health means misery and failure。
How can we keep our health？ Only by knowing and carefully obeying the laws of health。 A happy man is a healthy man， and only the healthy man can live a happy life。
The desire for good health is universal. Everyone who loves life understands how important health is. First， good health is the guarantee for enjoying life. The only desire of a patient is always to live an ordinary and healthy life。 Second, good health establishes a firm foundation for your ambition of the career. Without it， any lofty aspiration turns to be a daydream.
Then how to keep fit？ Everyone has his own answers to this question, while I think three principal suggestions should be followed. The first one is that a scientific diet should be adopted, which offers the necessities for your body. The second one is that physical exercises must be persisted, especially for the indoor people。 The last, but not the least, is that the cheerful mood should be kept。
In order to keep fit, I force myself to keep away from the “junk food”, although it usually tastes good, I even form a good habit of doing morning exercises。 And the beautiful music and good books always cheer me up.
Sports and Games
Sports and games do a lot of good to our health。 They can make us strong， prevent us from getting too fat， and keep healthy and fit。 Especially they can be of great value to people who work with their brains most of the day， for sports and games give people valuable practice in exercising the body。
What’s more， they make our life richer and more colorful. If we do not have a strong body， we will find it hard to do whatever we want. So persons of all ages enjoy watching and taking part in various kinds of sports—track and fields， swimming, skating, football， volleyball and basketball, etc.
Sports and games are also very useful in character training. They demand not only physical skills and strength but also courage, endurance， discipline and usually teamwork。 For boys and girls, what is learned in the playground often has a deep effect on their character。 If each of them learns to work for his team and not for himself on the football field， he will later find it natural to work for the good of his country instead of only for his own benefit。
A healthy citizen makes a strong country。 Let’s all take part in sports and games.
Smoking
It is well known that smoking does harm to the health。 Today， so many people still keep smoking， which has drawn wide attention of the society.
Smoking has so many disadvantages but no advantages at all. First， the cigarettes with nicotine in them do great harm to the health. Such diseases as pneumonia, lung cancer may be
caused or partly caused by them. Furthermore， the bad effects of cigarettes cost the smokers lots of money， which could be spent on other meaningful things. Thirdly， the accidents of fire all over the world every year are mostly caused by the still-burning butts （end）。
The government has formulated the regulation of no smoking in public places。 Yet its result is not so satisfactory。 From my point of view， it needs the common efforts of the society。 Not only the nonsmokers but the smokers should cooperate on this matter.
My Views on Large Modern Cities
Since every coin has two sides， living in large modern cities offers us many advantages， simultaneously causes many troubles。 Better education and better jobs are easy to get， and better medical care is convenient to receive in large modern cities。
People are usually well informed due to the advanced media, such as television, newspaper and net PC。 Large modern cities also provide varied entertainment for the city-dwellers。 The public places like cinema, bar， disco-ball are everywhere。
On the other hand, large modern cities are too big to control， so the traffic jams and traffic accidents often happen, and the social security is a headache problem。 And city—dwellers have to face the housing problem。 Usually a house is too expensive for the salary earning class to buy and the rent is also high。 Moreover, noise and pollution in large cities bring harm to people’s health.
Live in the City or in the Country
Where do you like to live， in the city or in the country？
Most cities are centers of economy, trade， transportation or culture。 With the development of economy and society, more and more people have flooded into the cities, which make the scale of the cities larger and larger. Surely， it is very convenient for shopping， education, business and so on. But it also has many disadvantages: the large population makes it crowded in each corner of the city; the big factories, too many cars， buses and trucks pollute the clean air； too much noise can make people mad. To live in the city， one even can't get enough room for living.
To live in the country is another thing。 You can breathe the fresh air cheerfully, own a spacious house with a big backyard, and relax yourself in quietness。 But when you want to go shopping, or take your child to school, perhaps you will complain about its inconvenient transportation， its remoteness…I am an ordinary person. I am always longing for the peaceful idyllic(田园诗般的） life of the countryside.
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