题目内容：

In the United States, children start school when they are five years old. In some states they must stay in school  u 1.   they are sixteen. Most students are seventeen or eighteen years old when they l 2.     high school. There are  t 3.   kinds of school in the United States: public school and private school.  M  4.   children go to public schools. Their parents do not have to  p  5.  for their education because the schools receive money from the government. If a child goes to a private school, his parents  h  6.   to pay enough money for his schooling. Some parents still choose private schools, though they are much more  e  7. .

Today about half of the high school students go to universities  a  8.   they finish the high school. A student at a state university does not have to pay too  m  9.   if his parents live in this state.

But many students work while they are studying at universities. In this way they can have good working habits and live by their own  h 10.   .