根据语境可知“孩子们在国家未来的发展中起着重要的作用”此处指代上文提到的“孩子们”故用they。

　　(2015·四川成都一诊)

　　ops in a small town were struck by a flood on last Wednesday.It had rained for four days while the river finally flowed over its bank and flood the town.Hundred of residents left their homes as the water flowed down the streets into their houses.Fortunate，no one was killed in the flood and it caused a lot of damage and many people became homeless.Two farms near the river was destroyed.Rescue workers managed reach the people there by boat.It's the pity that many farm animals dead as the water rose.

　　It is reported that homes and shops in a small town were struck by a flood

　　last Wednesday.It had rained for four days

　　the river finally flowed over its bank and

　　the town. of residents left their homes as the water flowed down the streets into their houses.，no one was killed in the flood

　　it caused a lot of damage and many people became homeless.Two farms near the river

　　destroyed.Rescue workers managedreach the people there by boat.It's

　　pity that many farm animals

　　as the water rose.

　　1．有last修饰的时间状on。

　　本句可表示“河流决堤的时候雨已经下了四天”或“雨下了四天后河流决堤了”所以连词可用when或before。while引导的从句的谓语只能用延续性动词。

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