When the teacher came into the classroom,all the students stopped( )(talk).(用词的适当形式填空)

问题描述:

When the teacher came into the classroom,all the students stopped( )(talk).(用词的适当形式填空)
请说详细点,我理解能力不强,

talking
stop doing sth:停止做事情
stop to do sth:停止,开始做其他事情.
全句的意思是:当老师走进教室,所有的学生鸦雀无声.