Although most adopted persons want the right to know who their natural parents are, some who have found them wish that they ______ the experience of meeting.
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.