Scientists had ( 寻找 ) for a solution to the mystery, but they didn't find it. 2 . On reaching the station, the passenger found someone in rags ( 游荡 ) around the station. 3 . There are a lot of ( 过错 ) in that page; please correct them and email me next morning. 4. —What are you ( 凝视 ) at? —A flying object in the sky. 5 . As soon as he finished the letter, he took out of the ( 信封 ) at once. 6 . You can't enter the room without your teacher's (permit) . 7 . For the more (adventure) tourists, there are trips into the mountains with a local guide. 8 . Her endless (patient) made her the best nurse in the hospital. 9 . I was almost frightened to death at the sight of the frightening (scenery) . 10 . He had a few (penniless) in his pocket.