21.【2012全国新课程】Sarah looked at finished painting with satisfaction.
A.不填；a B. a; the C. the; 不填 D. the; a
22. （基础题）I can't go to that opera.________，seventy dollars is just too much for me to spend on one evening.
A．In other words B．On the whole C．In a way D．I mean
23. （基础题）Pleasant music is often played ________ classes to make students refreshed and relaxed for a while.
A．after B．Between C．among D．over
