Must or Mustn't

Pupils____________obey the teachers.

Pupils___________ use the Internet at their IT lessons.

Pupils_____________use someone else's book or gym locker, or allow them to use yours.

Mobile phones__________be turned off during regular school hours.

Students__________have the following items at school: knifes, weapons, dangerous objects, drugs, and gang emblems.

You___________take off your hats and coats when you enter your classrom.