morsel|morsels

他连最后一口面包屑也没放过。

He didn't leave even the last ___morsel of bread.

她只找到了几片玻璃碎片。

She found only a few ___morsels of broken glass.

他只分给了我们一小块蛋糕，几乎不够尝一口。

He gave us just a small ___morsel of cake, barely enough to taste.