55. I would love _____to the party last night but I had to work extra hours to finish a report.

A. to go　　 B. to have gone　　 C. going　　　 D. to be first playing

54. The patient was warned _____oily food after the operation.

A. to eat not　　 B. eating not　　 C. going　　　 D. having gone

53. ______in thought, he almost ran into the car in front of him.

A. Losing　　 B. Having lost　　　 C. Lost　　　 D. To lose

52. The boy wanted to ride his bicycle in the street ,but his mother told him _____.

A. not to　　 B. not to do　　　 C. not do it　　 D. do not to

51. --You were brave enough to raise objections at the meeting.

　 --Well,now I regret ______that.

A. to do　　　 B. to be doing　　　 C. to have done　　 D. having done

50. We agreed _____here but so far she hasn't turned up yet.

A. having met　　　 B. meeting　　　 C. to meet　　 D. to have met

49. Paul doesn't have to be made _____. He always works hard.

A. learn　　　 B. to learn　　 C. learned　　　 D. learning

48. --I must apologize for _____ ahead to time.

　 -- That's all right.

A. letting you not know　　　 B. not letting you know

C. letting you know not　　 D. letting not you know

47. Rather than ______ on a crowded bus ,he always prefers ______ a bicy-cle.

A. ride; ride　　 B. riding ; ride　　 C. ride ; to ride　　 D. to ride; riding

46. The missing boys were last seen ______near the river.

A. playing　　　 B. to be playing　　　 C. play　　 D. to play