I saw _ UFO in the sky. 填a还是an?是根据U的读音填a 还是根据全称unidentified填an?

I saw _ UFO in the sky. 填a还是an?是根据U的读音填a 还是根据全称unidentified填an? I saw that they were watching TV in the hall同义句：I saw _ _ TV in the hall ___ the way,I saw a UFO yesterday. -Where's your brother now? -I saw him _ in the street a moment ago and i told him _.A、playing,don't do so B、playing, not to do so 这道题该怎么解释呢? 英语翻译I always believed in the ufo 材料：Mr.Li said,” I saw three aliens get out of the UFO” Wang Jun said,”I was studying when I saw the UFO outside the windows” Ma Yan said,”I saw two aliens playing football in the school hall.” Liu Ming said ,” I was eating lunch w 填入所缺字母let's (_ _ i _)in the river! 1.David was in the barber`s when the UFO arrived(对in the barber`s 划线提问）_ _ David when the UFO arrived2.Lily followed her father to see her mother in hospital（同义句）Lily _ _ her father to see her mother in hospital3.Tom had a traff They saw a UFO flying in the sky.(改为被动句）A UFO ______ ______ ______in the sky. they saw a ufo flying in the sky改为被动句a ufo ___ ___ ___ inthe sky i saw the alien get out of the UFO 这句话有没有错 I saw them _ basketball at nine o' clock in the morningA.playing B.playd C.to piay D.play I saw [你]in the bookstore yesterday I saw him in the street是什么意思 I saw you working in the I Saw You Walking In The Rain 用所给词的适当形式填空 1.We are very _ (surprise) at the news.2.While was _ (shop) ,I saw my best friend.3.The alien _ (get) out of the UFO,while I was shoping.4 This is an _ (amaze) story. I saw Sam's tall,built form a little way in the distance.