7．In the USA，children start school when they are five years old．In some states they must stay in school （46）Cthey are 16．But most students are 17or 19years old when they （47）Asecondary schools （中学）．There are two kinds of schools in the USA：public schools and private （私人的） schools．（48）B children go to public schools．Their parents don't have to （49）Btheir education because the schools get （50）C from the government．If a child goes to a private school，his parents have to get enough money for his schooling．Some parents（51）A like private schools though they are much more expensive．
Today about half of the high school students（52）C in universities after they finish secondary schools．A student at a state university doesn't have to pay very much （53）Bhis parents live in that state．
Many students （54）B while they are studying at universities．In this way they get into （55）A
working habits and live by their own hands．
| 46．A．and | B．so | C．till |
| 47．A．leave | B．enter | C．reach |
| 48．A．Several | B．Most | C．A few |
| 49．A．worry about | B．pay for | C．ask for |
| 50．A．books | B．teachers | C．money |
| 51．A．still | B．never | C．sometimes |
| 52．A．play | B．change | C．study |
| 53．A．before | B．if | C．whether |
| 54．A．smoke | B．work | C．fight |
| 55．A．good | B．bad | C．happy |
