66. ----Do you still remember when we went to the great wall？

　 ----I can’t remember it well, but____ it have been sometimes last may?　　 could

65. ---We didn’t see him at the lecture.

　 ---Neither　 anybody else. He　 ___ attended it.　　 　　did, can’t/couldn’t have

64. In case I______ fail, I would try again.　　　　　　　　　　　　　 should　

63.--Must we come tomorrow? --No, you 　　　.　　　　　　　　　 needn't

62.­­­____ you be happy!　　　　　 　　　　　　　　　　　　　　　　May　

61. Since it is already midnight, we______ as well leave.　　　　　　　 might

60. - What's wrong with your pen'?　 - The ink ____ come out.　　　 won' t

59. - You must phone us every week.　 - Yes, I _____.　　　　　　　 will

58. I think he could have joined us, but he ____.　　　　　　　　　　　 didn't

57. I___ never make such a mistake again. 　　　　　　　　　　　　　　will