他埋头于工作。

He ___buried ___himself ___in his work.

由于害怕亲密关系，他埋头于工作。

Terrified of intimacy, he ___buries ___himself ___in his work.

为了应对失去，她埋头于研究。

She ___buried ___herself ___in her research to cope with the loss.