supervise|supervising

孩子们玩耍时，两名老师在监督。

The children play while two teachers ___supervise.

联合国正在监督当地机构在灾区的援助分发。

The UN is ___supervising the distribution of aid by local agencies in the disaster area.

我们的主要活动将是在那些活动中监督 8 到 12 岁的孩子。

Our main activity will be to ___supervise the 8 to 12 year olds during those activities.