Read the following passage carefully. Have you ever seen a UFO? A UFO is an Unidentified Flying Object, a strange object or light that people see in the sky. Many people believe that these strange lights are really spaceships from another planet. For years people have seen and heard many odd things in the sky, blinking and glowing . lights, flying objects shaped like saucers, and moving objects making strange noises. Some people have even taken pictures of these unusal sights. Some of these UFOs are really aeroplanes, weather balloons or meteors. But many UFO reports are still a mystery. Now answer the following questions. 1) What do people believe about these strange lights? 2) What are these UFOs really?3) U.F.O stands for:a) Unknown Flying Object b) Unidentified Flying Object c) Unseen Flying Object.4) U.F.Os are believed to be spaceships from othera) countries b) continents c) planets5) Which of the following statements is true? a) UFOs are make-believe. b) Moving objects with blinking lights have to be UFOs c) People have seen moving objects making strange noises.