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Many people see strange things in the sky and think they could be UFOs （Unidentified Flying Objects）. Its certainly difficult to
1. ___ （explain） what happened to the young Australian pilot Frederick Valentich in 1978.
At 6：19 p.m. on October 21， 20-year-old Frederick took 2. ___ in a Cessna 182 from Melbourne. He had to fly over the sea to King Island， between mainland Australia and the island of Tasmania.
At 7：06 p.m.， Valentich contacted Steve Robey at Air Traffic Control in Melbourne，
3. ___ he saw a large aircraft flying over him. Robey was very 4. ___ （surprise）—he knew there shouldnt be any other aircraft in the area. But the small Cessna wasnt alone. Valentich watched the UFO flying above himself. The object was long and very fast，
5. ___ a green light. It looked like metal，
6. ___ it wasnt a plane. Then it disappeared from the sky.
At 7：11 p.m.， when Valentich was still 30 minutes from land， he reported engine 7. ___ （problem）. “Im going to try to reach King Island，” he told Robey. Suddenly he 8. ___ （shout）， “I can see that strange thing above me again， and its not an aircraft！” Robey heard
9. ___ strange noise over the radio， and then there was silence.
The Cessna 182 10. ___ reached King Island; the plane and pilot completely disappeared. We dont know what happened to Frederick Valentich.
（Key ? p. 37）
Many people see strange things in the sky and think they could be UFOs （Unidentified Flying Objects）. Its certainly difficult to
1. ___ （explain） what happened to the young Australian pilot Frederick Valentich in 1978.
At 6：19 p.m. on October 21， 20-year-old Frederick took 2. ___ in a Cessna 182 from Melbourne. He had to fly over the sea to King Island， between mainland Australia and the island of Tasmania.
At 7：06 p.m.， Valentich contacted Steve Robey at Air Traffic Control in Melbourne，
3. ___ he saw a large aircraft flying over him. Robey was very 4. ___ （surprise）—he knew there shouldnt be any other aircraft in the area. But the small Cessna wasnt alone. Valentich watched the UFO flying above himself. The object was long and very fast，
5. ___ a green light. It looked like metal，
6. ___ it wasnt a plane. Then it disappeared from the sky.
At 7：11 p.m.， when Valentich was still 30 minutes from land， he reported engine 7. ___ （problem）. “Im going to try to reach King Island，” he told Robey. Suddenly he 8. ___ （shout）， “I can see that strange thing above me again， and its not an aircraft！” Robey heard
9. ___ strange noise over the radio， and then there was silence.
The Cessna 182 10. ___ reached King Island; the plane and pilot completely disappeared. We dont know what happened to Frederick Valentich.
（Key ? p. 37）