[答案]
(1)Whatwereyoudoing
(2)Whatisthevideoabout
(3)Howdidyoumakeit
(4)Yes,Iam
(5)Youarewelcome
[解析]
72. 根据后文B的回答"I was making a video."(我正在做视频。)可知,故填What were you doing。
73. 根据B的回答"It's about our graduation party."(关于我们庆祝派对。)可知,故填What is the video about。
74. 根据B的回答"I made it by AI."(我通过AI做的。)可知,故填How did you make it。
75. 根据上下文"Are you interested in it?"(你对它感兴趣吗,A对AI制作视频感兴趣,I am。
76. 根据B的感谢"thanks in advance!"(谢谢提议,A应回应"不客气"。
[点评]
本题考查了"劝告/建议,",属于"基础题",熟悉题型是解题的关键。