Classroom rules
The first rule	All students must speak English inside the classroom. It's a good（1）___________to get more speaking practice.
The second rule	All students must be on time. Lessons start at （2）_________o'clock. It's not（3）_________ to arrive 20 minutes late.
The third rule	All students mustn't （4）_________their mobile phones during the lesson. Please （5）_________your phone off completely during the lesson.