Welcome to the Historical Museum, everyone! This stone knife _______ in South Africa and experts can’t be exactly sure about its use.
—________that middle school ________Beijing Normal University? —As far as I know,it is.
He opened the windows to ________ the smell of tobacco.
We don't have enough books for________;some of you will have to share.
Children should not be encouraged to ________the electronic dictionaries as it will make them lazier.
—Have you ________food? —Yes,our food________,so we must buy some immediately.