我认为这份报告严肃的基调比轻快的风格更有效。

I found the serious ___tone of the report more effective than a lighter approach.

经理的开场白为谈判定下了合作的基调。

The manager's opening remarks established a collaborative ___tone for the negotiations.

柔和的灯光和原声音乐为咖啡馆营造了一种轻松的氛围。

The soft lighting and acoustic music create a relaxed ___tone in the cafe.