Complete the text with the passive form of the verbs.

A series of mysterious lights 1)…..(spot) above Cambridge late Sunday night. Video footage of the unusual sighting 2)…..(capture) by eye-witness Steven Morgan, an amateur astronomer. The strange phenomenon 3)…..(observe) by Morgan while he was studying a passing meteor shower. In an interview with local journalists, he claimed the lights were a bright blue colour. At the moment, the video footage 4)…...(examine) by experts at London University to determine whether it is a hoax. An official report 5)…..(not / release) yet. However, it 6)…..(believe) by some who have viewed the video that the lights were fireworks from a nearby festival.

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