Переведите в пассивный залог

Question

Переведите в пассивный залог

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Answer 1

1 A strange noise can be heard in Taos.
2 An explanation hasn't been found by scientists for the Hum.
3 Yetis are said to live in the mountains.
4 The Naga fireballs were seen by many people last night.
5 The lights were believed to beUFOs.