Ⅱ.单项填空（共 15 小题；每小题 1 分，满分 15 分）
从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21.When you are having class , you should _______ the teacher.
A. concentrating B. concentrate C. concentrate on D. connect
22. Though ________ failure is the mother of success, everyone wishes to have _______ success.
A. \ , a B. the , a C. a , a D. \ ,\
23. The workers ________ their boss of having broken the labor law.
A. blamed B. accused C. charged D. scolded
24. Michael’s new house is like a huge palace, ________ with his old one.
A. comparing B. compares C. to compare D.compared
25. John ‘s success has nothing to do with good luck. It is years of hard work _______ has made him what he is today.
A. why B．when C．which D．that
26. To their ________, tom’s problem proved not to be as serious as they had thought．
