一旦打开，这瓶果汁在冰箱里可以保鲜一周。

Once opened, this juice will ___keep for a week in the fridge.

鲜牛奶不冷藏的话保鲜不了太久。

Fresh milk doesn't ___keep for long without refrigeration.

蜂蜜可以保存多年而不变质。

Honey can ___keep for years without spoiling.