【简介】感谢网友“雕龙文库”参与投稿，这里小编给大家分享一些，方便大家学习。
练习题：
1. She fell into deep thought, with ________.
2. ______________did scientists realize that the whole of the brain was involved in the working of the mind.
参考答案：
1. her eyes closely staring at the screen
2. Not until the middle of the eighteenth century
