flounder|floundered|floundering

渔民今天捕获了几条比目鱼。

The fishermen caught several ___flounder today.

鸭子在泥泞的池塘里笨拙地挣扎。

The duck ___floundered clumsily in the muddy pond.

由于管理不善，这家初创企业正在快速衰落。

The startup is ___floundering rapidly due to poor management.