他看起来是一位成功的专业人士。

He looks like a successful ___professional.

他参加了为期三天的专业培训课程。

He attended a three-day ___professional training course.

她辞去了兼职工作，成为一名职业歌手。

She quit her part-time job to become a ___professional singer.

她的演讲非常专业，赢得了观众的掌声。

Her presentation was highly ___professional and won the audience's applause.