根据下列各句句意和空白之后的汉语提示词，在答题卡指定区域的横线上写出对应单词的正确，完整形式，每空只写一词。

66．Professor Li gave us a most ______(令人费解的)lecture and most of us failed to understand it.

67．It makes no ____________（不同，有区别） to me whether he goes or not.

68. Americans think they’re good drivers _______ （比较）to drivers in other countries.

69. What’s the best _______(解决) to the problem?

70. You’d better come ______(直接，径直) to the point.

71. I am _______ (感激，感谢) to you for your timely help.

72. Would you like to be _______ (志愿者) in the next Olympic Games?

73. Karl Marks was ______ (强迫，迫使) to leave his hometown after Hitler came into power.

74. The boy sat at the desk, ______(假装) to be studying.

75. Li Ning was disappointed because he didn’t _______ (表现) well in the Soul Olympics.