Ⅳ。Proofreading and Error Correction 10%
　　Directions: The passage contains 10 errors. Each indicated line contains a maximum of ONE error. In each case, only ONE word is involved. You should proofread the passage and correct it.
　　Most people work to earn a living and they produce goods and services. Goods are either agricultural （like maize） or manufactured （like cars）。
　　Services are such things like education, 1.
　　medicine, and commerce. These people provide 2.
　　goods; some provide services. Other people provide both goods or services. 3.
　　For example, in the same
　　garage a man may buy a car or some service which helps him maintain his car.
　　The work people do is called as economic 4.
　　activity. All economic activities taken together make up the economic system of a town, a city, a country, or the world. Such economic system is the sumtotal 5.
　　of what people do and what they want. The work people do either provides what they need or provides the money with that they can buy essential 6.
　　commodities. Of course, most people hope to have enough money to buy commodities and services which are essential but which provide some particular 7.
　　personal satisfaction, such as toys for children, visits 8.
　　the cinema, and books.
　　The science of economics is basic upon the facts 9.
　　of our everyday lives. Economists study our everyday lives and the general life of our communities in order to understand the whole economic system of which we are a part. They try to describe the facts of the economy in which we live, and to explain how it works.
　　The economist methods should of course be 10.
　　strictly objective and scientific.