You can avoid the single supplement by agreeing to share a twin room.

你如果同意与人共住双人房就可免交单间附加费。

《柯林斯英汉双解大词典》

We can share my room, and it'll be like having a sleepover every single night!

我们可以共用我的房间，就像每晚都在外面过夜一样!

youdao

They share a lot of things, including room, food and toys.

他们分享很多东西，包括房间、食物和玩具。

youdao

Two,three or four students might share a room.

VOA: special.2009.03.26

For instance, in nearly all facilities Medicaid residents must share a room.

FORBES: Do You Really Want to Give Away Your Assets to Become Eligible for Medicaid Long-Term Care?

To transition the older ones to sleep at the same time (they share a room) I started sitting between their beds and stretching out my arms so that they can each hold a hand as they fall asleep.

FORBES: The Right to Choose: Work and Motherhood

The force is sharing resources with Warwickshire Police to save money and may share one control room.

BBC: Ludlow MP fears 999 response teams may go