21．During the students’ first teacher training year, they often visited schools for the _____ of lessons.
A．examination B．investigation C．inspection D．observation
22．Many studies already link the first meal of the day to better classroom .
A．performance B．function C．behavior D．display
23．Just as our teacher often ________ it, success is ninety percent attitude.
A．gets B．makes C．puts D．means
