1. They ____ (have) tea when the doorbell ____ (ring). 2. Father ____ (smoke) his pipe white mother ____ (read) a magazine. 3. While he ____ (mow) the lawn, it ____ (start) to rain. 4. He ____ (have) breakfast when the toaster ____ (blow) up. 5. When I ____ (come) into the office boss ____ (wait) for me. 6. When we ____ (see) Brian, he ____ (drive) a taxi. 7. Father ____ (wait) in the car while mother ____ (do) the shopping. 8. When he ____ (arrive) we ____ (have) dinner. 9. While they ____ (play) chess, we ____ (go) shopping. 10. They ____ (have) a party while he ____ (sleep).