1. While the scientists ________ the data, the power went out., were analyzing, have analyzed, analyzed, analyze, 2. The volunteers ________ the beach yesterday morning., clean, were cleaning, cleaned, have cleaned, 3. When the alarm ________, everyone was already outside., goes off, went off, has gone off, was going off, 4. She ________ her thesis when her computer crashed., writes, has written, wrote, was writing, 5. They ________ trees along the riverbank last weekend., were planting, planted, have planted, plant, 6. While he ________ to work, he heard the news on the radio., drives, drove, was driving, has driven, 7. The company ________ its new product last month., has launched, launches, was launching, launched, 8. I ________ abroad when I met my future business partner., was studying, study, have studied, studied, 9. The factory ________ toxic waste into the river before it was finally shut down., was releasing, has released, released, releases, 10. While researchers ________ the experiment, an unexpected result appeared., conduct, have conducted, conducted, were conducting, 11. She ________ the warning sign as she rushed past., didn't notice, doesn't notice, wasn't noticing, hasn't noticed, 12. What ________ you doing at this time yesterday?, have, were, was, did, 13. The team ________ the championship two years ago., won, were winning, win, have won, 14. While the workers ________ the bridge, traffic was diverted., repair, were repairing, repaired, have repaired, 15. He ________ his passport during the trip., was losing, loses, has lost, lost, 16. I ________ home when it started to rain heavily., walked, have walked, was walking, walk, 17. The government ________ new regulations last week., has announced, was announcing, announces, announced, 18. While she ________ her project, the lights suddenly went out., presented, was presenting, presents, has presented, 19. They ________ such a huge turnout at the event., weren't expecting, don't expect, didn't expect, haven't expected, 20. The students ________ the topic when the teacher walked in., were discussing, discuss, discussed, have discussed, 21. The researchers ________ their findings at the conference last year., were presenting, have presented, presented, present, 22. While the engineers ________ the new bridge, an earthquake struck the region., were building, built, build, have built, 23. She ________ a documentary about climate change when the interview began., has watched, was watching, watched, watches, 24. The company ________ its headquarters to another city in 2015., moves, was moving, has moved, moved, 25. While the committee ________ the proposal, new evidence emerged., review, reviewed, have reviewed, were reviewing

E12-UNIT 1

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