他是我们的一个熟人。

He's an ___acquaintance of ours.

她有许多朋友和熟人，并花很多时间与他们相处。

She has many friends and ___acquaintances and spends a lot of time with them.

我在会议上遇到他；他只是个熟人，不是亲密朋友。

I met him at a conference; he's just an ___acquaintance, not a close friend.