Seeing the funny picture, the whole class burst into laughter.

看到这张有趣的照片，全班同学都突然大笑起来。

The whole class laughed for a while and continue listening to the class.

全班同学笑了一会之后继续听课。

Suddenly, a cat burst into our classroom, catching the attention of the whole class.

突然，一只猫冲进了我们的教室，引起了全班同学的注意。

As the approaching graduation ceremony, the sadness of departure hangs over the whole class.

随着毕业典礼临近，离愁别绪笼罩着整个班级。

When one student behaves disgracefully, it reflects badly on the whole class, even the whole school.

一个学生的不光彩行为会给整个班级、甚至整个学校带来很坏的影响。