我们必须制止欺凌行为。

We must ___put ___a ___stop ___to the bullying.

许多年轻人发现很难戒掉游戏习惯。

Many youngsters find it hard to ___put ___a ___stop ___to their gaming habits.

新法律旨在制止非法倾倒垃圾。

The new law aims to ___put ___a ___stop ___to illegal dumping.