1. They began working in the factory five years ago. (worked)
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2. This is the first time I have visited London, (never)
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3. She last heard about her best friend when she met his mother, (hasnt)
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4. The last time I had a frill English breakfast was two years ago. (for)
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5. They have raised the environmental campaign for several months. (Its)
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6. The students had submitted their papers by the time the bell rang, (before)
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7. Lucy had watched three movies before her friends arrived, (after)
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8. The light had gone out before we got out of the office, (when)
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9. Before the manager explained everything clearly, everybody had left the office, (by the time)
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10. My sister had prepared a big dinner by the time we came home, (before)
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