奶奶用筛子把面粉里的杂质过滤掉。

Grandma used a ___sieve to remove impurities from the flour.

在做蛋糕之前，先把糖粉过筛。

Make sure to ___sieve the powdered sugar before making the cake.

研究人员仔细筛选数据以找出重要模式。

The researchers ___sifted through the data to identify important patterns.