You should turn off your mobile phone when the plane _______

You should turn off your mobile phone when the plane _______ when the plane take off ,you（ ）use your mobile phone we____ use mobile phone when the plane take off You must turn off your cell phone when you take a plane同意句 You must turn off your cell phone when you take a plane.改为否定 You must turn off your cell phone when you take a plane改为否定句 征集作文:Turn off your mobile phone You should () when the plane takes off Don't be available all the time.Turn off your mobile phone a You'd better--------(keep)off your mobile phone during the c when did your father buy you the mobile phone 换为被动语态 when（ ） （turn）off the tap when you brushing your teeth