我们买钢琴是为了孩子们的利益。

We bought the piano ___for the ___children's ___benefit.

经理引入弹性工作时间是为了员工的利益。

The manager introduced flexible hours ___for the ___staff's ___benefit.

他捐出全部财产是为了孤儿们的利益。

He donated his entire fortune ___for the ___orphans' ___benefit.