Sixty five years ago, surveys of public school teachers indicated the most pressing classroom problems were

The correct answers are "tardiness, talkative students, and chewing gum."

Tardiness from students who overslept or lives far away mostly experiences these problems, while talkative students are common, even nowadays there are still talkative students, especially those who are into social media. Lastly, chewing gum became a habit for some students, which is why it was considered to be one of the problems in the classroom.

This link explains it