I saw _ UFO in the sky. 填a还是an?

I saw _ UFO in the sky. 填a还是an? they saw a ufo flying in the sky The farmer said he saw ____ UFO in the sky the other day.A.a The farmer said he saw-------UFO in the sky the other day A They saw a UFO flying in the sky.(改为被动句） 英语改被动语态They saw a UFO flying in the sky.(改为被动句）A UFO（ ） （ ） 填a,an或the ,1.I can see a bird in sky. I ___I cuold fly like a bird in the sky one day.填want 还是hope Is it ______ UFO in the sky填什么? 动词填空!I hope I()(see)a UFO in the sky with my eyes one day. When I was walking in the street yesterday, I saw a UFO ____ I saw a bird in the sky拜托各位了 3Q