Attention to the use of modal verbs in passive structures. (Перепиши предложения в пассивном залоге. Обрати внимание на употребление модальных глаголов в пассивных конструкциях.)Образец:Children may take their toys to the classChildren’s toys.............to the class.1. Someone must warn them about the danger.They...........,... about the danger.2. You can hear this song everywhere.This song............... everywhere.3. Mary must bring the letters today.The letters............... by Mary today.4. The courier has to deliver the parcels today.The parcels.............,,.... by the courier today.