Correct the mistakes in these sentences.…

1. I was cooking the meal when the door bell rang.2. Who helped you to do your home task? 3. As we were watching him the small boy suddenly ran away.4. He sent a letter and I stopped worrying as everything seemed OK.5. When we entered the club a beautiful girl was singing.6. It was very late, but when I entered his room he was reading a book.7. When I was talking in the street last night someone hit me.