Sallywalkedontotheplatform,pickedupapieceofchalkandwroteontheblackboard:"Rule1:Wearefamily!"Allstudentsstoppedtolookather.AndshecontinuedwithRule2,Rule3等Inthefollowingweeks,Sallyworkedout10classrulesandpostedthemonthewallsoftheclassroom.Shepatientlyexplainedalltherulestothestudentsandrequireeveryonetofollowthem....