房子的屋顶是平的。

The house has a flat ___roof.

雨滴打在车顶上，发出哒哒的声音。

Raindrops tapped on the ___roof of the car.

政府设定了价格上限以控制市场过热。

The government imposed a price ___ceiling to curb the overheated market.

他们用金属板给新房子盖了屋顶。

They ___roofed the new house with metal sheets.