add|added|adding|adds

持续的噪音加剧了我工作时的压力。

The constant noise ___adds to my stress at work.

她正在往咖啡里加糖以使其更甜。

She is ___adding sugar to her coffee to make it sweeter.

学生应先补充更多美德，再讨论社会最需要哪些美德。

Students should ___add more virtues before discussing which ones society needs most.

工程师在桥下增设了小缝隙，为蝙蝠营造栖息地。

Engineers ___added small gaps beneath the bridge to make a home for bats.