她在派对上表现得像个公主，但其实她只是普通上班族。

She was ___acting like a princess at the party, though she's just an ordinary office worker.

她在学校戏剧中扮演主角，非常享受表演的过程。

She loves ___acting as the lead role in the school play.

总经理出差期间，由他临时担任代理负责人。

He is ___acting as the temporary head while the general manager is away.