这份文件在签署前需要仔细检查。

The document needs ___close inspection before signing.

孩子们在院子里玩耍时，要密切注意他们。

Keep a ___close watch on the children while they play in the yard.

父母应该密切关注孩子的网络活动。

Parents should keep a ___close watch on their children's online activities.