7. Who (to quarrel) at that time? - His friend (to quarrel). 8. Beth and Tom (to watch) a TV programme when their mother (to ask) them to help her. 9. You (to help) your mother while she (to wash) up? 10. The scientist (to work) in the laboratory when some­body (to switch) off the light. 11. Whom you (to talk) on the phone to, when I came into the room? 12. Jane (to have) a walk in the park when it (to begin) to snow.

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