几个家庭正在合租一辆巴士去机场。

Several families are ___pooling together to rent a bus to the airport.

雨后，院子里积了一滩水。

After the rain, water was ___pooling in the yard.

雨水在院子低洼处积聚成小水坑。

The rainwater is ___pooling in the low spots of the yard.