他无聊地快速翻动着桌上的杂志。

He ___flipped through the magazine on the table out of boredom.

她轻轻翻动纸牌，将两半牌交叉叠合在一起。

She gently ___riffled through the cards, interleaving the two halves together.

孩子们喜欢在小溪的急流浅滩处寻找光滑的鹅卵石。

The children love searching for smooth stones in the ___riffle of the creek.