21. —I'm sorry to keep you waiting. I'll make short work of this.

—           .l'm not in a hurry.

A. Take it easy  B. Take your time 

C. Not at all    D. Do as you like

22. The education of          young has become        hot and serious topic in the present society.

A. the; 不填     B. a; the         

C. 不填; the   D. the; a