A good breakfast is i_________. A test was given in the United States a short time ago. People of d_________ages, from 12 to 83, were asked to have the test. During the test, they were given all kinds of breakfast, and sometimes they got no breakfast at a________.Scientists wanted to see how well their bodies worked when they had eaten different k_________of breakfast.

The results（结果）show that if a person eats a right breakfast, he or she will work b_____   than if he or she has no breakfast. If a student has fruit, bread and milk before going to school, he will l__________ more quickly and listen more carefully in class.