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like to invite friends（to their homes for an evening of food，drink and conversation.Formal dinner in fine homes and hotels in the US are much the same as formal dinners anywhere in the world.

But the most people in the US have no servantsry at home, their dinner parties at home tend to be informal, Guests may sit down at a table , or as many new small homes many have no separate dinning room or very small dinning space,guests can also serve themselves and eat in the living room,holding their plates or trays on their knees.

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There are many costs.First of all ，there is tuition.At some schools，the tuition is very high，ten thousand dollars a year or more .At other schools，it may only be few hundred dollars a year. At some community colleges，tuition is free.There are other costs as well.Many students leave their homes to go to schools in other cities.They may live in dormitories or apartments ，and they must pay for it.Finally，students must buy textbooks for their courses.

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there are camps for all interests:horse?

back riding,rock climbing,art and science, to name a few. There are even camps to learn how to be a clown.Many Americans have happy memories of? going away to camp as kids.Now grown-ups can relieve those times. In some states, for example,adults can spend a week at a snowboarding camp.

But for for some adults,the best camps are the ones where they can be with their kids.There are some weekend camp programs for parents and children together.

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It is important to understand the greenhouse effect. The greenhouse effect is the rise in the temperature caused by absorption of the

Sun' s heat and light by the Earth 's surface ,which then is reflected back and trapped within the earth's atmosphere. The greenhouse gases， help to keep the earth warm, and this is the reason why life on earth (原來連讀了，連讀真的很重要）has existed，and still thrive.however with the increase in the gases like carbon dioxide，ozone, earth has gotten nearly 14%(暈聽成40了）hotter than what it used to be fifty years ago.