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1.主动语态：The snowslide killed him. 雪崩害死了他。

被动语态：He was killed by the snowslide.他死于雪崩。

2.主动语态：We use electricity to runmachines. 我们用电力来开动机器。

被动语态：Electricity is used to run machines.电力被我们用来开动机器。

3.主动语态：Bell invented the telephone in1876.贝尔于1876年发明了电话。

被动语态：The telephone was invented byBell in1876.电话是贝尔于1876年发明的。