Поставьте глагол в нужную форму.
1. The children were very tired because they (play) all day long.
2. Elvis Presley (sing) lots of hit songs.
3. By the time of our arrival, my mother (cook) the dinner.
4. I (listen) to music, when somebody knocked at the door.
5. By 1960 most of Britain's old colonies (become) independent.