2. complete the sentences using must, have to, need to, can, may or their negatives 1) Students of elementary and junior nigh school needn't take an exam to enter the nigh school.2) The Japanese school year starts in April and ends in March. 3) Japanese students have to study on Saturdays too. 4) Students mustn't drive to school. 5) When students arrive at school, they must take off their shoes and put on school shoes. 6) One high school class lasts 40 minutes. 7) High school students have a duty to clean the entire school building after classes. ​