21.If you make most of every minute in class day after day, there will be switch in grades.
A．/; / B．the; a C．/; a D．the; /
22.. The United Kingdom of Great Britain ______ three main parts England, Scotland and Wales.
A. is made of B. makes up C. is consisted of D. consists of
23. _ _ busy schoolwork, the children also have to take arts, music and sports classes in their free time.
A．Rather than B．Owing to C．Except for D．Apart from
