当她看到枪时，她开始大声尖叫。

When she saw the gun, she started ___screaming ___her ___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.

当他们的队伍打入制胜一球时，球迷们大声欢呼。

The fans ___shouted ___their ___heads ___off when their team scored the winning goal.