Помогите пожалуйста с тестом, от него зависит моя четвертная ...

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Помогите пожалуйста с тестом, от него зависит моя четвертная оценка* Очень хочу чтобы вышла 4.. А эту тему вообще не понимаю(

Тест на тему "Страдательный залог"
 
11. When we arrived at the airport, we found that the flight ___. A had been cancelled B is being cancelled C has been cancelled 12. The flowers in the flowerbeds ___ by this evening. A are being watered B were watered C will have been watered 13. America ___ several centuries ago. A had been discovered B was discovered C will be discovered 14. The floors in the office ___ every day. A are swept B will have been swept C were being swept 15. An old woman ___ while she was living with her children. A is being looked after B was being looked after C will be looked after 16. I think the money ___ back in the nearest future. A had been paid B were paid C will be paid 17. My car ___ at the moment. A was being repaired B has been repaired C is being repaired 18. The exams ___ by 3 in the afternoon. A will have been finished B were being finished C are being finished 19. Olympic Games ___ every four years. A are held B had been held C will have been held 20. When we returned home, the walls ___. A has been painted B had been painted C will be painted