____ you know your potential(潜力), you have to rely on many other people to get to where you are.
The room is empty except for a bookshelf ________ in one corner.
The witnesses ________ by the police just now gave very different descriptions of the fight.
________ in the early 20th century, the school keeps on inspiring children's love of art.
________ which university to attend, the girl asked her teacher for advice.
George returned after the war, only ________ that his wife had left him.