71. I've got it.(我懂了。) .
72. I can't afford that.(我承担/买不起。) .
73. I did it, I'm so happy now.(我做到了,现在我很满意。) .
74. I don't care.(不关我的事/我不管。) .
75. I don't think so.(我不这么想/我看不会/不行/不用。) .
76. I guess so.(我想是吧。) .
77. I have no other choice.(我别无选择。) .
78. I will do my best!(我会尽力的!) .
79. I mean it.(我是认真的。) .
80. I'm so scared.(我怕极了。) .