21. --- I need to advertise for a second-hand mountain bike.
--- _______£¿David just plans to sell his present one.
A. Why not B. Why bother C. So what D. What for
22. We have never had such___¬¬____ success in football! Yesterday we won the match with________ score of 5:0.
A. a; a B. the; a C. /; the D. a ; /
23. A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process _____ many factors lead to the change.
A. which B. what C. where D. that
24. Although _____ considerable success as an outstanding basketball player, Yao Ming keeps working hard after his retirement.
A. achieving B. achieved C. to achieve D. having achieved