用所给单词的适当形式填空。

Miss Green is ____ (give) us a lesson.

    It is Sunday tomorrow. We are going to watch a football game. It is between a Japanese team and a Chinese team. The football game will begin at 4：00 in the afternoon. Our teacher, Mr. Wang will watch the football game with us. We will go there by bus. We think we can come back at about 6：00 in the afternoon.

某校九年级（1）班学生小王，由于对学习不感兴趣而中途辍学．经常与一些不三不四的人混在一起，出入网吧．逐渐走上盗窃的道路，并且由于盗窃数额较大而受到法律的制裁。在少年管教所期间，经过管教人员的教育、感化，小王的心灵受到了净化，对以前的行为非常后悔．并且积极地改正了自己的错误。

请回答：

当我们伸肘时，肱二头肌和肱三头肌的舒缩情况分别是（    ）