Answer:
a common but good way is to ask if you MAY go to the toilet. you cant say CAN because your teacher will tell you "i know you can" so you have to say MAY.
another one is to say can i have a new pencil and have a really small one there and your teacher will probably say i think you will have one in you desk and look through your desk and by the time they have looked through it all your lesson should be over. if you a willing to get in trouble you talk and annoy people and you will get told on or another thing like that and be sent to the office and convince you teacher that you have a blocked ear and you cant hear if your loud or not and you were just asking for a rubber and or you weren't trying to annoy that PERSON.Carmen Harris(: