1 . 原本期待乘坐火车的乘客被告知火车已被取消。(过去完成进行时，非限制性定语从句)
Passengers, ________ to board a train, were told it had been cancelled.

2 . 人们躺过的那些地方，草都被压倒了。
The grass had been pushed down in places ________.

3 . By the time his parents got home, the boy ________ for three hours.
他父母到家的时候, 那个男孩已经玩了三个小时电脑游戏了。