房子的屋顶是平的。
The house has a flat ___roof.
暴风雨过后,工人们正在修理屋顶。
After the storm, workers are repairing the ___roof.
雨滴打在车顶上,发出哒哒的声音。
Raindrops tapped on the ___roof of the car.
蝙蝠倒挂在洞穴的顶部。
Bats hang upside down from the ___roofs of caves.