Помогите!!Нужно выбрать правильное!!
Students were having/had/did have a party when the doorbell
Nobody rang/was ringing/were ringing it because everybody were dancing/danced/was dancing
So when Peter finally opened the door, a very angry policeman were entering/was entering/entered
Даю 30 баллов

1. Student were had ...2. Nobody were ringing ... were dancing3. So when Peter finally opened the door, a very angry policeman was entered ...