他被任命代表委员会发言。

He has been appointed to ___speak ___on ___behalf ___of the committee.

我相信我代表所有员工发言。

I believe I ___speak ___on ___behalf ___of all employees.

作为律师，她在法庭上代表她的客户发言。

As a lawyer, she ___speaks ___for her clients in court.