A UFO is on the sky用A还是the.UFO前

A UFO is on the sky用A还是the.UFO前 there is a big bird is flying on the blue sky.这样说对吗 有2个is可以吗,可以用on the sky They saw a UFO flying in the sky.(改为被动句）A UFO ______ ______ ______in the sky. the heaven is on the sky they saw a ufo flying in the sky改为被动句a ufo ___ ___ ___ inthe sky 英语改被动语态They saw a UFO flying in the sky.(改为被动句）A UFO（ ） （ ） （ ）in the sky. 主动该被动（英语）急!They saw a UFO flying in the sky.是填空 A UFO ( )( )( ) in the sky Is it ______ UFO in the sky填什么?this is______orange ball 填什么? The sun is high ______the sky.A.in B.on C.under D.by选什么 有关颜色的英语单词词填空：The sky is（?）on a sunny day. 时态填空：When the teacher ___ (fly) in the sky,he ___ (see) a UFO. the snow is falling on the sky对吗? is,in,plane,the,there,sky,a -------------is“a flying ball in the sky” break on the sky 英语翻译Can you see a cicular building which look like UFO where is situated in the sky?你看见位于天空的那栋像UFO的圆形建筑吗?which那里可以用非限制性定语吗？如果可以的话where是不是要去掉，is前加个逗 动词填空!I hope I()(see)a UFO in the sky with my eyes one day. The sea is the vastest on the earth.The sky is vaster than the sea.A human mind is the most among急救!中文意思/