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1) Electricity drives many machines in modern factories.
2) This scientist carried on many practical experiments.
3) We apply electricity for many purposes.

1. Many machines are driven by electricity in modern factories2. Many practical experiments were carried on by this scientist3. Electiricity is applied for many purposes (by us)

1)Many machines in modern factories are driven by electricity.2)Many practical experiments were carried on by this scientist.3)Electricity is applied by us for many purposes.