词汇应用

     One day, a man had an (1)__________(usual) experience. When he looked up into the sky, he saw a strange thing

(2)__________(fly) in the sky. It was not a plane or a bird. He couldn't (3)__________(explain) what it was. After that,

many people saw these unusual things. Those people saw these things in the sky, on the land, or in the water. These

things (4)__________(call) UFOs.    Many scientists have a great (5)__________(interested) in (6)__________(study)

UFOs. We often call these scientists UFOlogists. They study UFO (7)__________(report) in newspapers and on the

Internet. They find out that about 90% of all the UFOs people saw were just natural phenomena or man-made things.

Some scientists even spend their whole (8)__________(life) on UFOs. Some scientists are trying (9)__________(find)

UFOs from the (10)__________(inside) world. We call (111)__________(they) UFO Hunters. In fact, what they want to

find are (12)__________(alien). I believe they will find what they want to find.