21．Zhang Hua is clever and works hard at his lessons.________________
A So is Li Ming B, So does Li Ming
C.It was the same with Jim D. So it is with Li Ming
22．If we had taken such effective measures much earlier, the river___ so seriously now.
A is not polluted B would not be polluted
C had not been polluted D would not have been polluted
23．It was ______ of you not to disturb us.
A rude B considerate C impolite D cruel
24．I behaved badly yesterday and I am ________ of myself now.
A .ashamed B ashame C shame D ashamed for