[填空题]Most Americans start school at the age of five when they enter{{U}} (36) {{/U}}Children do not really study at this time. They only{{U}} (37) {{/U}}for half the day and learn what school is like. Children attend{{U}} (38) {{/U}}school for the next six years. They learn to read and write and work with numbers. They also study the world and its people. After six years, children go to{{U}} (39) {{/U}}high school for three years and senior high school for another three years. This is called secondary education. In their secondary schooling, children cover more{{U}} (40) {{/U}}knowledge and begin to concentrate on their special{{U}} (41) {{/U}}. They usually study further in history, geography, government, English and literature. They may{{U}} (42) {{/U}}to study foreign languages, advanced mathematics or science, such as physics or chemistry. Higher education takes place in colleges and universities. The{{U}} (43) {{/U}}course is four years.{{U}} (44) {{/U}