( )21. How beautifully she sings! I have never heard ________.

　　A. the better voice B. a good voice

　　C. the best voice D. a better voice

　　( )22. Wait till you are more ________. It‘s better to be sure than sorry.

　　A. inspired B. satisfied C. calm D. certain

　　( )23.—Hi， Tracy， you look tired.

　　—I am tired. I _______ the living room all day.

　　A. painted B. had painted C. have been painting D. have painted

　　( )24.—How was your recent visit to Qingdao?

　　—It was great. We visited some friends， and spent the _______ days at the seaside.

　　A. few last sunny B. last few sunny

　　C. last sunny few D. few sunny last