USACO MAR07 Silver Balanced Lineup 平衡的阵容
USACO MAR07 Silver Cow Traffic 奶牛交通
USACO OCT07 Silver Obstacle Course 障碍训练场
USACO NOV07 Silver Cow Hurdles 奶牛跨栏
USACO NOV07 Silver Milking Time 挤奶时间
USACO DEC07 Silver Building Roads 建造路径
USACO JAN08 Silver Telephone Lines 架设电话线
USACO JAN08 Silver Cow Contest 奶牛的比赛
USACO JAN08 Bronze Costume Party 化装晚会
USACO FEB08 Silver Eating Together 麻烦的聚餐
USACO FEB08 Silver Meteor Shower 流星雨
USACO FEB08 Silver Game of Lines 连线游戏