Complete these language school rules with may, must and must not. 1 Course books are compulsory. Students ___ bring course books to every lesson. 2 The school is noise-free. Students ___ play music during the breaks. 3 Students ___ use mobile phones during lessons. However, they ___ use mobile phones during breaks. 4 Students ___ come to school on their bikes but they ___ leave them in front of the school. Students ___ bring the bikes into the school building. 5 Eating and drinking is only allowed in the cafeteria. Students ___ eat or drink during lessons.