When I ____ (arrive) the techer ____ (write) the summary. He ____ (cross) the road when I ____ (see) him. Why ____ (they/shout) at you when I ____ (wake up)? They ____ (fix) the computer when I ____ (open) the door. ____ (Mary/break) her leg while she ____ (skate)? 6. I ____ when she ____ (knock) on the door. 7. When I ____ (see) Jim at the disco he ____ (not/talk) to the DJ. 8. I ____ (watch) a film on TV when the electricity ____ (go) out. 9. The Titanic ____ (not/cross) the Pacific Ocean when it ____ (strike) an iceberg. 10. Paul ____ (not/fall) while he ____ (run) away. 11. Carol ____ (fall) asleep while she ____ (read) a book. 12. While my father ____ (drive) home, he ____ (not/answer) his mobile phone.

Exercise #18

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