她郑重承诺会准时参加明天的会议。

She is ___promising to arrive on time for tomorrow's meeting.

许多校友承诺为学校的新图书馆项目捐款。

Many alumni are ___pledging donations for the school's new library project.

他正在宣誓加入兄弟会，下周会有入会仪式。

He is ___pledging a fraternity and will attend the initiation ceremony next week.