what's that(mystery) thing in the tree填什么为什么

what's that(mystery) thing in the tree填什么为什么 What’s that ______ the tree?----A cat.in on 选什么啊,为什么? what’s --------in the tree?填it 行不行 what's in the tree?回答 “what's that in the n_____picture?”那个空怎么填? What's that in the tree,can you see?There must( ) some birds What’s in that tree?——There are some birds in that tree. What’s that near the tree?What’s near the tree?的区别在哪里? What's the best thing that ever happen to you? look!what's in the tree?___bird,i think.A.A B.An C.The D.不填 the thing that =what? what's that in the box?用什么回答?