It was revolutionary - when the petrol engine was invented., It's difficult for us - to imagine that horses were once the only means of personal transport., It will be an even greater advance - to replace human drivers with driverless cars., It's high time - deaths on the roads were reduced, It's not much use - trying to hold back technological progress, It's conceivable - that driverless cars will leave us free to read, talk on our moblie phones and admire the scenery.,

unit 10

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