In the USA，children start school when they are five years old．In some states they must stay in school 1  they are sixteen．But most students are seventeen or eighteen years old when they  2 ， secondary schools．There are two kinds of schools in the USA：public schools and private schools．3  children go to public schools．Their parents do not have to 4 their education because the schools 5 money from the government．If a child goes to a private school，his parents have to get enough money for his schooling．Some parents still 6 private schools

though they are much more expensive．

    Today about half of the high school students  7 in universities after they finish secondary schools．A student at a state university does not have to pay very much if his parents  8  in that state．

    Many students  9 while they are studying at universities．In this way they get into 10  working habits and live by their own hands．