我被选为代表全班发言。

I've been chosen to ___speak ___for the whole class.

我认为在表达对老师们的感激时，我代表了许多人。

I think I ___speak ___for many in expressing our appreciation for teachers.

作为团队领导，她在会议上代表所有成员发言。

As the team leader, she ___speaks ___for all members during meetings.