1 . The boy ________ is our monitor.
在教室里学习的男孩是我们的班长。

2 . The practice of tai chi aims to maintain ______ ______ of yin and yang in the body through opposite movements. Eventually, tai chi brings about a state of physical balance and mental peace. （根据句意填空）

3 . 明天他要去看望在车祸中受伤的学生们。
He will go to see the students ______tomorrow.

4 . 她总是八点半到那儿，与孩子们随意交谈。(非谓语动词短语作状语，chat)
She was always there at half past eight, ________.