孩子们不小心撞到了书架，差点把它推倒。

The kids accidentally bumped into the bookshelf, almost ___toppling it over.

抗议者们联合起来推翻了独裁政府。

The protesters united to ___topple the dictatorship.

强风把路边的招牌吹倒了。

The strong wind ___toppled the roadside sign.