Bị động với động từ khuyết thiếu

Bị động với động từ khuyết thiếu:
8. They could carry out a serious experiment last year.
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9. They will grow rice in the north.
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10. Our dog bit the post man yestrerday.
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11. He has to finish the report on time.
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12. They will hold an international conference in Hanoi next month.
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13. The Persian could invent windmills around 500 years ago.
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14. I'll meet her at the airport.
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