用所给词的适当形式填空
That is_________________ book.(Mike)
It’s ________ orange  (a, an )
These are my _____________(sister) .
His _______________(parent) are in Beijing now.
There are four_________(photo) on the wall.
____(that) two boys are David and Bill.
These are my_____(box)
This isn’t Tom’s eraser.____(he)is white.
Helen’s ruler isn’t here.___(she)is in the pencil box.
This ______(be not)my pen.My pen is white.