convince, disappear, due to, result in, dismiss, make up, assume , go missing, creatures , come across

Police in America have stepped up their search for Justin, a fifteen-year-old boy who 小题1:._________two days ago in Dover. People have shown great interest in this event 小题2:. ________
sightings of puzzling lights in the key and reports of alien visits around the time of his 小题3:__________.
His sister Kelly recalled that standing inside were lots of strange 小题4:___________with white skin and large black eyes. She was frightened. But his mother 小题5:._________ Kelly was having a dream and sent her to bed.
Police have 小题6:. _________ the possibility that Justin was taken by aliens, but are also looking into other possibilities. Detective Sam Peterson, who has taken charge of the case, thought that people sometimes 小题7:.__________amazing stories, and there might be other possibilities such as murder. There is really no hard evidence that aliens took him away. They wouldn’t give up until they found 小题8:.____________ evidence.