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by singing. When a bird sing, however, its song 
usually means much more than that the bird is happy. Birds have many reasons for singing. 
They sing to give
information. Their songs are their language.
They sing when they want to attract a female (hen) bird. It is their way of saying that they are looking for a wife.
keep away. To a bird, his tree or even a branch of tree, is his home. He 
does not want strangers to come near
him, so he sings to warn them.
cannot sing well, he usually has some other means of giving important
information. Some birds dance, 
spread out their tails or make other sings. One bird has a most unusual way of finding a wife. It builds a small garden of shells and flowers.
Nowadays almost everyone in the world have had a contact with computers. A great part of them has been using international computer’s net known as Internet.
I think using internet has more advantages then disadvantages. In the first place, the internet benefits us in many ways. It provides us with much information from every corner of the world. It helps us to know about what is happening on the earth and updates us with the most recent news. Also, the internet helps us to widen our social network with many friend in every country in the world. Through some programs such as Skype, facebook, Yahoo Messenger, etc, we have chance to make friend and talk to a variety of people. Moreover, it entertains us. Sometimes we can spend times listening to music or watching films on some websites. However, the internet also causes us many problems. The first one is to our health. Some people spend too much time searching and playing on the internet, which is not good for their brains and eyes. Next, it also prevents us from some activities such as reading books or going our with our friends. In addition, some programmes on the internet contain some bad content such as violence or ***** which are not good for young people's mental lifem.
In short, everything has its two sides, so does Internet. Therefore, it is necessary that we use it for right purposes.
Nowadays, internet has increasingly developed and become part of our life. Thanks to the internet we can get information easily. By using the internet, we can relax after a hard- working day. We can listen to music, read newspapers, see good film or play video game. On the other hand, it is mean of education. We have online schools and study online lessons. However, the internet has disadvantages. It is not only time- consuming and costly but also dangerous because of virus and bad programs. The internet users sometimes have to suffer various ricks such as spam, and personal information leaking. Therefore, along with the benefits of the internet, it has also many disadvantages.
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