ostracize|ostracized|ostracizing

自从那次争吵后，班上的同学都开始孤立他。

After the argument, his classmates started to ___ostracize him.

整个办公室都冷落了那个经常散布谣言的同事。

The entire office ___ostracized the coworker who kept spreading rumors.

因为他说了不合时宜的话，班上其他同学都开始孤立他。

After he made inappropriate remarks, the whole class started ___ostracizing him.