31. I ____ sit up all night , and that was harmful to my health.

　 A. should　　 B. used to　 C. was used to　 D. got used to

30. ----What do you think of the food here ?

　 Oh, wonderful ! We ____ a better place.

　 A. won`t find　　 B. mustn`t have found　 C. can`t find　 D . couldn`t have found

29. How ____ there be such a thing ?

　 A. may　　　 B. can　　 C. must　 D. will

28. I talked for a long time, and in the end I _____ make her believe me.

　 A. could　　 B. can　 C. must　 D. was able to

27. ---- _____ he ____ already?　 ----He _____, for he is always in good manner.

　 A. Could; have left ; can`t have left　　 B. Could ; have left; couldn`t have left

　 C. May; have left ; may not have left　 D. Must ; have left ; needn`t have left

26. A wise man ____ sometimes make a mistake.

　 A. may　 B. must　 C. would　 D. can

25. He must have finished his homework for a long time , ____ he ?

　 A. mustn`t　 B. didn`t　 C. needn`t　 D. hasn`t

24. I　 wish to go home now, ____ I ?

　 A. may　 B. can`t　 C. must　 D. do

23. --- Is John coming by train?

　 ---He should , but he ___ not . He likes driving his car.

　 A. must　 B. can　 C. need　 D . may

22. ---There were already five people in the car but they managed to take me as well .

　 ---It ____ a comfortable journey.

　 A. can`t be　 B. shouldn`t be　 C. mustn`t have been　 D. couldn`t have been