这是我的床。

This is my ___bed.

是时候上床睡觉了。

It's time to ___go ___to ___bed.

房间里有一张单人床。

There is a ___single ___bed in the room.

我们在这片河床上发现了许多鹅卵石。

We found many pebbles on the river ___bed.

煤矿工人在地下发现了厚厚的煤层。

The coal miners discovered a thick ___bed of coal underground.