21. Being able to afford _______ drink would be ______ comfort in those tough times．
A．the; the B．a; a C．a; 不填 D．不填；a
22. She prefers the sofa made of real leather although it costs more than that made of ___leather.
A. fascinating B. permanent C. artificial D. Conventional
23. After class, Mr. Li’s extra instructions to the class helped ____the assignment to his students.
A. classify B. clarify C. cater D. compensate
24. It can be easy to ______such bad habits as smoking and drinking, but it is not so easy to quit.
A. slide into B. turn into C. put into D. draft into
