一旦打开，这个产品如果冷藏可以保存三天。

Once opened, this product will ___keep for three days if refrigerated.

新鲜牛奶不冷藏保存不了多久。

Fresh milk doesn't ___keep long without refrigeration.

这种奶酪在阴凉干燥的地方保存得很好。

This cheese ___keeps well in a cool, dry place.