1 we .... eat sweets in the classrooms A can B must C mustn't D don't have to 2 I .... do my home work . my teacher said so A can B mustn't C have to D don't have to 3 this is the smoking room at this airport . you ... smoke in this room A must B mustn't C can D don't have to 4 I ...,.. listen to the music i like . my present like it too A can't B must C mustn't D don't have to 5 i .... watch TV late at night . My present say I must go to bed early A can't B must C can D don't have to 6 we ... be quiet A must B mustn't C has to D don't have to 7 you ... speak on the mobile phone on an aeroplane A can B must C mustn't D don't have to 8 you ... put the rubbish into the bin A must b mustn't c has to D don't have to 9 you ... take photos in this museum . It's a against the ruler A must B can C mustn't D don't have to 10 you ... make noise in this area . A can B must C mustn't D don't have to làm và giải thích giúp mình nhé