1. Were you sleeping when the phone rang?2. They saw an accident while they drove to London.3. He was waiting for the bus when I met him.4. The burglars were breaking into our house while we were sleeping.5. Did you pass the exam last week? Yes, I did.6. Which countries was she visiting while she was traveling in Europe?7. It was a beautiful day. The sun was shone and the birds were singing.