Nowadays almost everyone in the world has contacted with computers. A great part of them has been using the international conputer's net known as Internet. Nobody can deny the important of the Internet to our daily life. However, the Internet has its own advantages and disadvantages.

On one hand, Internet is a big global store of information. You can find many kinds of information which is available on the Internet by some popular searching engines, such as: google.com, yahoo.com,etc. It helps us to communicate with other people around the world easier. The lastest news is always updated on the Internet,too. And it is also a means of education. We can learn foreign language, look up information or take online courses. It is almost an unlimited source of education materials for you to get.

But on other hand. Internet is harmful to our health: Some people spend too much time searching and playing on the Internet which is not good for our brains and eyes. It is not only time- consuming but also destroy relationship because it interferes with family life and communication. And the viruses can spread rapidly and infiltrate systems; destroy data, software of computer. They can attack to your privacy and get some information about you.

In a word, besides learning and entertaining on some websites on the Internet, we also need to limit the time and content that can be accessed to create a secure virtual enviroment.

The Internet plays an important role in our modern life. However, every coin has two sides and we can find out pros and cons of the internet by my following provement.

The Internet is a breakthrough in developing technology. It brings us wonderful advantages. First, education is more and more improved due to appearance of the internet. Students can learn and look for basic knowledge online without spending too much time in the libarary. This leads to the fact that it is very convenient for both teachers and students to broaden their perception. Second, the internet shorten the distance of people even though they are very far from each other. Skype or Yahoo are good ways for them to contact and have fun. It is true to say that distance is not a big problem in such a developing technology world. Third, the internet makes everything easier and faster. For example, we can send or receive documentary through email for a short time wwhile 10 years ago, we need to wait foe 3 or 4 days to send to a far distence.

On the other hand, the internet also has drawbacks. People especially teenager are easily involved in computer games. They take so much time to sit in front of the screen to play games. This doesn't only affect to their health but it also decrease the amount of money which their parents earn by hard works. They can't understand that money doesn't grow on tree. Moreover, the internet prevents them from taking part in outdoor activities beacause of the internet's attraction. This will slowdown socal skills and cause their inconfidence .

In a word, the inetrnet is one of the most wonderful inventions in the world. However, it also causes trobles in our life. Thus, we should use it in moderate

There are two kinds of energy in our life. They are renewable and non-renewable sources of energy. The non-renewable energy sources include oil,coal,natural gas,... The renewable energy sources include wind, solar, biogas, hydro,... Therefore, we should use more renewable energy than non-renewable ones in the future, because the non-renewable energy sources produce a lot of carbon dioxide. That's bad for the environment, and these energy sources are going to run out soon. The renewable energy sources are abundant, cheap, clean and they're eco-friendly. They will last forever.

Renewable energy comes from a source that will not deplete. Two common examples of this type of energy are solar power and wind power. Geothermal power, hydropower, biomass, and tidal power are additional forms of renewable energy that produce power for our planet right now.

The primary advantage of renewable energy is that fewer potentially harmful emissions are released into the atmosphere. Although fossil fuels are used to create the products that allow for this power to be produced, most forms of renewable energy can become carbon neutral in 5 years or less.

The disadvantage of renewable energy is that it can be costly. Although wind power and solar power have become cost-competitive with coal-fired power and nuclear power in some communities, some forms are not cost-competitive globally yet when the cost per kilowatt hour is compared. In 2015, the lifetime cost per kilowatt hour of conventional coal was 9.5 cents, while the cost of offshore wind was 15.8 cents.

There are additional advantages and disadvantages of renewable energy to consider as well.

Living in the countryside has a lot of advantages, but also many disadvantages. As the advantage we can consider the fact that the country is less polluted and the traffic isn't so heavy. You are fit and you don't need to worry about your health condition, because in the countryside the air and water are so clean. In the country there are many plant species. There aren't any huge blocks of flats, modern skyscrapers or bothersome traffic jams. In the country you are free to admire the breathtaking landscapes such as huge meadows, peaceful hills or forests. You can enjoy walking in the forest and picking mushrooms or hunting. Another advantage is that you may easily build a big house and the garden, because charges for ground are much lower than in the suburbs. Moreover, living in the countryside is cheaper than it is in the city, so you probably may afford many other things, because the prices are lower. What is more, you can invite your friends to the barbecue organized in your garden. It would be great! The other positive side is the safety. In the rural area the crime rate is much lower. There aren't a lot of housebreaks and the possibility of burglary is also lower. In the countryside people usually and keep eyes on neighbour's estates. They always react when something strange is happening. Country life is very peaceful and silent. You will enjoy the feeling of peace.

However, there are a lot of positive aspects of living in the country side, there are also some disadvantages. Living in the country is slower. People don't need to hurry and have a lot of time. People in the country don't have to work so many hours as they do in the city. On the other hand, they don't earn so much money. Moreover, there aren't such interesting things to do during free time. The unemployment rate is also much higher than in the city. The problem may be also the communication. If you don't have your own car, you may have problem how to commute to work. The same problem concerns the access to the hospitals, schools, police stations and shops, which are usually located far from the village. Last of all, there are some dangers connected with country life such as heavy snowfall or rainfall.

To sum up, I think that living in the country may have a lot of advantages such as fresh air, breathtaking landscapes and comfort, but a lot of people decide to stay in the city, due to the fact that the life in the town is easier. The easy access to shops and other institutions is the great advantage.

Solar energy captured by solar panels is a limitless form of energy, as the earth is bombarded with extreme amounts of solar energy every day, according to the National Renewable Energy Laboratory. It's also clean, producing no carbon dioxide, and is very low-maintenance, since solar panels have no moving parts.

Unfortunately, the National Renewable Energy Laboratory says its high installation cost makes it up to four times more expensive than the cost of electricity from a standard utility company. For optimal operation and maximum energy production, it requires year-round sunny weather and is very expensive if repair is necessary, according to the U.S. Environmental Protection Agency.

rewable:wind,solar enery,hydro,nuclear,biogas...

non rewable:coal,oil,natural gas...i think people will use it more in the future