1) 2) Bill(should / must/can/ shouldn't) drink milk every day. He is very thin.2) Students(shouldn't should / must / can) leave the classroom before the ring bells.3)You(should / shouldn't / must / can) brush your teeth after breakfast.4)Your father(should / must/would / can) stop smoking. 5)(Can / Must / Should / Would) you pass my pencil to me?6)You (mustn't/ shouldn't / can't / couldn't) talk aloud in the library.7)(mustn't/ should / can/ could) smoke cigarette in hospital.8) (should / must/can/ could) visit our grandparents more often.9) shouldn't / mustn't / can't / can) touch burning things.10) (mustn't / can't/ shouldn't / couldn't) drive too fast in the city.