I like sports very much. I have 5 ____  (篮球) and 4 baseballs. Do you ____  (知道) where they are. They’re under my bed on the ____ (地板). I have a ____ （兄弟）.____  （他）name is Peter, he likes volleyballs. He has a ____  (大的) volleyball collection. He thinks it is ____  (有趣的). He plays it  ____   (每个) day at ____  (学校) with his ____  (朋友们).

小莹和小博士下棋，小莹执圆子，小博士执方子．如图，棋盘中心方子的位置用（﹣1，0）表示，右下角方子的位置用（0，﹣1）表示．小莹将第4枚圆子放入棋盘后，所有棋子构成一个轴对称图形．他放的位置是（   ）