妈妈用筛子过滤掉汤里的杂质。

Mom used a ___sieve to strain the impurities from the soup.

做蛋糕前，别忘了把面粉筛一下。

Don't forget to ___sieve the flour before making the cake.

研究人员需要从大量数据中筛选出有用的信息。

Researchers had to ___sift through tons of data to find valuable information.