【判断题】一个 8 × 8 棋盘,减去对角的两个格子后依然存在完美覆盖.( )
【简答题】I wouldn’t have worked so hard,if I had known how easy the examination would be.可改写为:I wouldn’t have worked so hard,_________.
【简答题】I had always _______upon the children that if they worked hard they would succeed in life.
【简答题】Why did he stand at the back of the theatre after he got back from the car? Because he didn't want to ______ in his row again.