Definition: something that you know is true, exists, or has happened Level: A2
你知道一个有趣的事实吗？猫一天要睡很多个小时。
Do you know an interesting ___fact? Cats sleep many hours a day.
这是一个简单的事实：太阳从东边升起。
It's a simple ___fact: the sun rises in the east.
我知道她确实在撒谎。
I knew for a ___fact that she was lying.
