72. Her husband was sound asleep.

　　她丈夫睡得很熟。

　　73. I can assure you that your son will be happy here.

　　我可以向你保证，你儿子在这里会很快乐的。

　　74. We book early to assure ourselves of seats.

　　我们及早订票以确保有座。

　　75. I met him at the bus stop.

　　我在公共汽车站遇到他的。

　　76. Please don't laugh at him.

　　请不要嘲笑他。

　　77. The airplane flies at 900 kilometers an hour.

　　飞机以每小时900公里的速度飞行。

　　78. It took them several days to cross the Atlantic Ocean.

　　他们花了好几天的时间穿越大西洋。

　　79. The enemy attacked us at night.

　　敌人在夜里向我们进攻。