追查贴我的大字報! : 美術學院红旗畫兵批陶漫画

On the paper:
Chinese: 追查貼我的大字報!
Pinyin: Chuicha tie wo de dazibao!
English: Trying to find out: hang my big character poster

Tao Zhu says:
Chinese: 唔
Pinyin: wu
English: “oh”, but also “no” in Cantonese