Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.

So sad was she thatshe burst into crying. 3.她气得忍不住大叫起来。 So angry was she thatshe couldn’t help shouting. 练习： 1. that she slept on the ground. 简太累了，只好睡在地上。 2._____that my mind went blank. 我太紧张了，脑子一片空白。

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.