这场表演太棒了！我笑得前仰后合。

The show was great! I ___laughed ___my ___head ___off.

其他学生在她离开时笑得前仰后合。

Other pupils were ___laughing ___their ___heads ___off as she went.

他在争论中大喊大叫。

He ___shouted ___his ___head ___off during the argument.