Definition: If something freezes or is frozen, it becomes hard and solid because it is very cold. Level: B1
水在0摄氏度时结冰。
Water ___freezes at a temperature of 0°C.
地面冻得硬邦邦的。
The ground had ___frozen solid.
当湖面结冰时，我们可以在上面滑冰。
When the lake ___freezes over, we can go skating on it.
