it must be morning,____ the birds are singing

The day must be breaking,_the birds have begun singing. The birds are singing ____ the tree.横线上可以填on吗 The day breaks , ____ the birds are singing.添as 还是for 给个理由先, There are some birds singing( )the trees (The sun is shining,birds are singing. The day breaks ______the birds are singing. the day breaks______the birds are singing. The birds are singing in the tree.对singing提问 求一首英文歌.歌词好象有the sun is shining the birds are singing it's a there are some birds singing in the tree,这个句子有there be 句型,又有 there are some birds singing in the tree, 这个句子有there be 句型,又 The birds (are singing) in the tree括号部分提问