It’s high time that we students________ harder as the examination is drawing nearer.
He looked as though he _________ a ghost(鬼).
He stood for an instant with his hand still ___________.
_____ is known to all, the age _______ children can go to school is seven.
He told me that he was very familiar _______ the surroundings there and I told him that the people there were familiar _____ me.
. When the teacher came in, the student pretended ________ his lessons.