---I think English is ____unimportant subject.---I don’t think so. It is ____useful tool when we talk with foreigners.
—Is that your baseball? —__________.That’s her baseball.
Mike is _____ the family photo and the photo is ______ the wall.
I know father’s mother is my _______
There is ________ Mp4 and _____ ID card in _____ box.
——Is Dave your son? ——__________.